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President Trump鈥檚 disclosure to Russian officials of sensitive intelligence provided by a US partner in the fight against the Islamic State threatens to put a chill on one of Mr. Trump鈥檚 priorities 鈥� the global effort to defeat Islamist terrorism.

That鈥檚 because counterterrorism work depends on a high level of trust among partner nations, international security experts say. The partners rely on each other to use the highly sensitive information, which sources may have risked their lives to gather, judiciously and to mutual benefit.

Violate that trust by loosely sharing intelligence from at-risk sources, the experts add, and information critical to stopping one attack 鈥� or prevent a new means of carrying out deadly attacks 鈥� can dry up.

鈥淭his whole episode is terrible for trust 鈥� and trust is what makes intelligence sharing work,鈥� says Joshua Rovner, an expert in relations between leaders and intelligence officials at Southern Methodist University in Dallas.

鈥淪haring intelligence is very risky for the side that鈥檚 giving the information up, and especially if what鈥檚 involved is a human source inside ISIS,鈥� he adds. 鈥淪haring that kind of information with a third party is not something you do lightly.鈥�

Trump shared ISIS-related information the US obtained from another country with Russian Foreign Minister Sergei Lavrov, as well as with Russia鈥檚 ambassador to Washington, when the two visited the Oval Office May 10.

At a White House press conference May 16, national security adviser H.R. McMaster deemed the information Trump shared as 鈥渨holly appropriate鈥� and further stated that the president wasn鈥檛 even aware of the country that provided the information. The New York Times reported that the source was Israel.

What worries intelligence officials is that the information shared 鈥� which US officials say concerned ISIS methods of placing explosives inside electronic devices like laptops 鈥� could be 鈥渞everse-engineered鈥� to pinpoint the source or sources of the information.

The Russia factor

Adding a kind of 鈥渙n-top-of-everything-else鈥� aura to the revelations is the fact that Trump chose to share the information with Russia 鈥� a fact that may not sit well with many Americans or with America鈥檚 counterterrorism partners in Europe.

鈥淭he information sharing is not really the problem. I must tell you that in foreign policy this kind of thing goes on all the time,鈥� says Jeffrey White, a specialist in Middle East military and security affairs at the Washington Institute for Near East Policy (WINEP). 鈥淲hat makes this very bad all around is that this was with Russia, and only underscores [Trump鈥檚] unwillingness to accept that Russia is an enemy state that is not looking out for our interests.鈥�

At one level, thwarting attacks planned by ISIS, Al Qaeda, or other terrorist groups intent on attacking the West depends on a global web of intelligence sources 鈥� some of whom provide crucial information at extreme personal peril.

The prospect of having highly classified information about those sources bandied about 鈥� even if by the president of the United States to another global power pledging to crush Islamist terrorism 鈥� can鈥檛 help but cause nervous sources to clam up, and the relaying of valuable information to go cold.

More broadly, destroying the scourge of international terrorism depends on a high degree of trust in international relationships 鈥� including sometimes between partners who have access to vital information but who prefer to keep their level of cooperation with the United States under wraps. If partners decide they can no longer rely on the US to safeguard the intelligence they provide on terrorists and their organizations, they may think twice about sharing information that could prevent attacks.

Trump鈥檚 information-sharing with Russia may not perturb some US allies that are more focused on garnering US support for other priorities. For example, Saudi officials, preparing for what they are calling a 鈥減ivotal鈥� summit with Trump in Riyadh this weekend that is to feature more than 50 Muslim nations, are pushing aside fears over intelligence leaks while praising 鈥渃loser cooperation鈥� with the Trump administration on top-tier concerns like Iran.

鈥淭here is full security, intelligence, and political cooperation with the new administration that will only continue,鈥� says an official Saudi source, who was not authorized to speak to the press and thus insisted on anonymity.

鈥淭he new US administration sees the region and the threats that face it like Saudi Arabia [does], and its policies are much more in line with Saudi policies than the previous administration,鈥� says Jasser al-Jasser, an analyst and columnist at the semi-official Saudi daily Al Jazirah. 鈥淎n incident or leak would not derail this important partnership.鈥�

Keeping information from Trump

But reactions from European partners are likely to be much more critical of the president, experts there say.

鈥淒onald Trump was a businessman who speculated in real estate using other peoples' money. Now as president he is taking risks with other peoples' intelligence (assets),鈥� says Irwin Collier, director of North American Studies at Free University of Berlin.

鈥淐learly people stop lending to speculators who fail to pay back when they fail,鈥� he says, 鈥渁nd [now] intelligence agencies聽have witnessed their worst fears, [that] the president of the United States risks their people and methods to satisfy his own ego.鈥�

One mitigating factor, Mr. Collier says, is that German intelligence agencies are dependent on the US sharing intelligence with them. As a result, he says, he doubts it will come down to a widespread refusal to share from the German side.

鈥淏ut they will definitely work out procedures to double-insulate their sources and methods before sharing,鈥� he adds. 鈥淭hey will seek assurances that their US colleagues figure out ways of keeping particular information very far from the current occupant of the White House.鈥�

Some even see the spectacle of the American president casually sharing hard-won intelligence with the Russians as pushing European officials back to a mistrust among powers that some thought had ameliorated in recent decades.

鈥淲e are almost going back to this cold war type of environment where information obtained by the other side, it could be misused and lives potentially could then be in danger,鈥� says Sajjan Gohel, a terrorism expert at the London-based Asia-Pacific Foundation. 鈥淥ne has to be very careful. Especially more-so when you are discussing things with Russia.鈥�

Ties to intelligence community at risk

WINEP鈥檚 Mr. White says that as worrying as the impact on US relations with its intelligence partners may be, he is much more concerned about what this latest crisis in the Trump White House says about White House-intelligence community relations.

Calling it 鈥渧ery clear to me鈥� that the information about the intelligence sharing, first reported in The Washington Post, was leaked by someone in intelligence, White says, 鈥淭his indicates to me that the Intell Community is out to get Trump, and that鈥檚 not a healthy thing.鈥�

SMU鈥檚 Dr. Rovner concurs that damage has been done to 鈥渋ntelligence policy relations,鈥� right when, he says, signs were mounting of steady mending in White House-intelligence community relations.

But he is less optimistic about repairing the breach he anticipates is widening with international counterterrorism partners as a result of the Oval Office ISIS information sharing.

鈥淚 really think the difficulty so many countries are now going to have sharing information with the US will be a factor as long as Trump is in office,鈥� Rovner says. 鈥淚ntelligence people around the world are seeing a US president that is unreliable, unpredictable 鈥� and not the kind of leader you鈥檇 entrust with your most sensitive information.鈥�

Staff writer Sara Miller Llana contributed to this story from Paris; Correspondent Taylor Luck from Amman, Jordan; and Correspondent Rachel Stern from Berlin.