Senior Republicans reportedly said the White House has been unable to secure some of the key legal and communications staff they wanted.
The former FBI chief's testimony is expected to reveal Trump's intent when he asked for a halt of the Michael Flynn investigation.
The former FBI director is scheduled to testify before the Senate Intelligence Committee on Thursday.
Robert Mueller may also expand the investigation into the current Attorney General Jeff Sessions and his deputy.
Comey will face questions in the Senate on June 8 about whether he was pressured him to drop investigation into Michael Flynn.
Democrats, allies intensify calls for FBI and Justice Department investigations into Sessions's role in the Trump-Russia saga.
The FBI is reportedly scrutinizing Kushner's meetings with Russian ambassador Sergey Kislyak and banker Sergey Gorkov.
Democratic Representative Al Green has revealed that he is currently drawing up articles of impeachment against President Donald Trump.
The president's decision to fire FBI chief James Comey did not poll well with voters, who disliked the manner in which he was terminated.
The first request from the U.S. came ahead of the presidential election, while the second one came at the beginning of 2017.
Russia investigations, a lack of federal and Republican support and repeated leaks mean the president looks less and less in control.
The ex-FBI director told a friend that a one-sided hug with the president left him feeling "disgusted."
A memo written by James Comey accused Trump of urging his former FBI director to end the federal investigation into Michael Flynn.
The deputy attorney general also admitted knowing FBI Director Comey would be fired before writing a memo justifying the move.
The ghostwriter of Trump's best-seller says the president needs to figure out how to resign so he can "turn a loss into a victory."
The special counsel was known at the FBI for being strong-willed, with a very different leadership style to James Comey, sources tell Newsweek.
The meeting follows a week of mounting scandal in the White House over the firing of FBI director James Comey.
To fill appointments, Trump keeps turning to the law firm Kasowitz, Benson, Torres and Friedman, which has represented him for years.
The president is everywhere. If, like the writer, you are trying to escape, read on for a dose of reality.
Employees, bosses and even spouses have reason to keep records.
The latest revelations concerning the president have led to a flood of money being placed on his impeachment.
Donald Trump's National Security Adviser Flynn resigned over contact with Kislyak. Now Russia could be moving its man—and eyes are on the U.N.
Paul Visoky, a general contractor in Luzerne County, admits it would bother him if Trump had tried to end the Flynn probe, but says he wouldn't believe a Comey memo on the issue.