Though Mr Trump has the worst ratings of any new president on record-less than 40% of Americans approve of him-most Republican voters are still behind him.
Though Mr Tillerson was granted an audience with Mr Putin only late in the day, the meeting was described by the Secretary of State as "productive" despite "a low level of trust between our two countries".
House Speaker Paul Ryan insisted on Thursday that Congress will overhaul the US tax system this year despite the chaos consuming Washington and the political divisions in Congress. "Our job is to be responsible, sober and focus only on gathering the facts".
"Whenever the Vice President and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide, transmit to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office, the Vice President shall immediately assume the powers and duties of the office as Acting President".
The Russian leader also mocked the idea that Trump had shared secrets during the Oval Office meeting, calling the allegations "political schizophrenia".
Asked what he thinks of Trump presidency so far, Putin said it's up to the American people to judge but his performance can only be rated "only when he's allowed to work at full capacity", implying that someone is hampering Trump's efforts, but he never said who.More news: Mental health professionals look to make policy changes
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Addressing the Comey memo, GOP Rep. Blake Farenthold of Texas said: "If Comey felt like the president was trying to obstruct justice, Comey would have been duty-bound to report it to the DOJ and act on it". Trump's White House counsel, Donald McGahn, was a Jones Day partner who served as the general counsel to his presidential campaign. The report, on Tuesday night, added to the chaotic atmosphere in Washington following Trump's firing of Comey on May 9 and a separate report that Trump gave sensitive information to Russian officials. They said they expected "conduct more appropriate" from Turkey, a member of North Atlantic Treaty Organisation and a key USA ally.
Questions over the discussion come amid reports Mr Trump asked former FBI director James Comey to drop an investigation into ex-national security adviser Michael Flynn and his ties to Moscow. But other legal experts said investigators would consider a series of interactions among the president, the FBI and the Justice Department about the Flynn investigation and a broader counterintelligence probe into Russian interference in the 2016 election. "I hope you can let this go", referring to the Flynn investigation.
Republican Senator Richard Burr, the committee chairman, and the assistant chairman, Democratic Senator Mark Warner, announced in a statement that they had sent a new letter to Comey, who had rejected their previous invitation because he wanted to testify in public, not exclusively in private. 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 White House hopefully will see this as a jolt to support them in driving this forward".
Revelations that President Donald Trump asked then-FBI Director James Comey to end an investigation before firing him have sparked a debate about whether or not Trump's actions were an obstruction of justice.
Mr Flynn was Mr Trump's first national security adviser, but was sacked after misleading the government over his meetings with Mr Kislyak - he apparently offered to reduce sanctions on Russian Federation before he was appointed, but it is illegal for private citizens to conduct U.S. diplomacy. "Memos, transcripts, tapes - the list keeps getting longer", he said. Comey said he replied that "I agree he is a good guy" but said nothing to Trump about limiting the investigation.
White House's National Security Advisor Michael Flynn after he was sacked just 24 days into the job.