Trump's meeting with Lavrov and Kislyak came as the White House deals with a series of scandals linking members of Trump's team with Russian Federation.
The New York Times reported that Mr Trump had, during one of their conversations, asked Mr Comey to "let it go" when it came to the investigation into alleged ties between Russian Federation and former National Security Advisor Mike Flynn.
Curbelo, one of the most threatened GOP congressmen, is a frequent Trump critic who had been facing stinging criticism in his Democratic-leaning district for voting for House Republicans' healthcare legislation.
"This adds to a darkening cloud of controversy and disarray hovering over the White House". "But before we form opinions and advocate for action, we need to know what the facts are".
"What we have is a memo of a president asking highly inappropriate questions of an Federal Bureau of Investigation director", he said.
On Wednesday, House Speaker Paul Ryan said Congress needs to gather all relevant information before "rushing to judgment".
The leaders of the Senate Intelligence Committee on Wednesday asked the FBI to turn over memos written by former bureau Director James Comey as part of its ongoing investigation into Russian meddling in November's presidential election. "So there are a lot of unanswered questions".
The White House quickly responded, saying it never asked Comey or anyone else to end the investigation into Flynn.
The Republican chairman of the House Oversight Committee, Jason Chaffetz, has said he will ask Mr Comey to testify next week. Lawmakers are already demanding the White House turn over any USA transcript or other information that would convey what happened. "The shoes continue to drop, and every couple days there's a new aspect".
Second-ranking Senate Democrat Dick Durbin told reporters, "Each day as this unfolds, this pattern of obstruction of justice grows".
Whether Republicans can dust themselves off may depend on what the Comey memos and other documents show.
A pair of Senate committees, meanwhile, wants more information about Comey's interaction with President Trump.
In response to news that CBS had struggled to speak with Republican lawmakers, MSNBC host Chris Hayes chimed in on Twitter, writing, "Glad it's not just me!"
"Let's get to the bottom of what happened with the director". And the best way to get to the bottom of it is for him to testify ... "I'm not going to take a memo, I want the guy to come in", said Sen. Lindsey Graham, R-S.C.
He said: "The President wasn't even aware of where this information came from - he wasn't even briefed on the source or method of this information either". The description in the purported memo "is not a truthful or accurate portrayal of the conversation between the President and Mr. Comey", it said.
The foreign minister smiled back, chuckling at the brief exchange the same way he did when he stood next to his American counterpart, Secretary of State Rex Tillerson, as he was asked about Trump's decision to fire FBI Director James Comey just days after the head of the federal agency reportedly requested additional resources for the Russian Federation investigation.
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