But King also said that he respects Comey's integrity.
The information had come from a United States ally, which was later revealed by USA media to be Israel.
Defending Trump's actions, officials played down the importance and secrecy of the information, which had been supplied by Israel under an intelligence-sharing agreement, and Trump himself said he had "an absolute right" as president to share "facts pertaining to terrorism" and airline safety with Russian Federation.
The White House said a memo written by Comey after he met with Trump in February was not an accurate portrayal of the conversation.
The next crucial question is whether Trump's conversations with Comey and his later firing of the director present a compelling case for obstruction of justice in the FBI's investigation of Russian intervention in the 2016 election and any ties to the Trump campaign.
Congressional investigators are expected to seek copies of any notes taken during the meeting, a congressional source said.
The Justice Department's Office of Legal Counsel has opined in the past that the president can not be indicted or prosecuted at all, "because it would impermissibly interfere with the President's ability to carry out his constitutionally assigned functions and thus would be inconsistent with the constitutional structure".
Moscow's top diplomat, Lavrov represents Russian foreign policies that are often sharply at odds with USA aims in Syria and Europe.
Trump said on Twitter on Tuesday he had an "absolute right" to share facts with Russian Federation so that it can be more active in fighting Islamic State militants.
A USA president has the authority to disclose even the most highly classified information at will, but US and allied officials said that by giving information to Russia, Trump had endangered cooperation from an ally that has intelligence on Islamic State.
Arizona Republican representative Trent Franks defended Trump.
Log in, look out: Cyber chaos spreads with workweek's start
Kyodo News said one personal computer was affected at one office at East Japan Railway Co., but train services were not affected. The ransomware is spread by taking advantage of a Windows vulnerability that Microsoft released a security patch for in March.
Top Senate Democrat Chuck Schumer says "history is watching" and "the country is being tested in unprecedented ways" in the wake of a New York Times story that says President Donald Trump asked former FBI Director James Comey to call off an investigation into former National Security Adviser Michael Flynn. That seems far, far, less likely to me than a much more characteristic explanation for Trump actions: He was just shooting off his mouth without having any idea about potential consequences.
Islamic State, or ISIS, holds territory in Iraq and Syria and is a common foe of Moscow and Washington. 2017, on Capitol Hill in Washington. He appears to have shared highly classified information with the Russian government.
"The president wasn't even aware of where this information came from".
Senator Susan Collins, the Maine Republican, said it would be "very troubling" if Trump did share "sensitive reporting" with the Russians.
While President Donald Trump nor anyone else from his team took to the air Sunday regarding a tumultuous week in Washington, Haley was out front regarding the president and his dismissal of FBI Director James Comey.
"Something's not happening day after day". He said he would give the Federal Bureau of Investigation a week and then "if we need a subpoena, we'll do it".
Mitch McConnell, the Republican leader of the Senate, said simply, "It would be helpful to have less drama emanating from the White House".
The euro surged more than 1 percent against the dollar on Tuesday, rising to its highest since Trump was elected president in November.
Sen. John McCain says the latest revelations out of the Trump White House are "at a point where it's of Watergate size and scale". But the sheer controversy of the act, especially as it involved handing over to an adversarial nation something that could endanger our own and our ally's national security, engendered some of the harshest criticism of his presidency so far. The FBI concluded after an investigation a year ago that there were no grounds to pursue any charges against Clinton.
"Ultimately the Republicans said there was something wrong that was done, they went down to the White House and said 'Mr". Senator Susan Collins called for the Senate Intelligence Committee to be briefed on the matter, while Bob Corker, head of the Senate Foreign Relations Committee, said on Monday the allegations were "very, very troubling".
The White House strenuously denied Comey's account.