House Minority Leader Nancy Pelosi called for Donald Trump Jr., former Trump campaign chairman Paul Manafort, and President Trump's son-in-law Jared Kushner to testify before Congress on their meeting with a Russian lawyer last year.

"One after another, senior Trump officials have been caught hiding secret meetings with Russian agents," Pelosi, D-Calif., said in a statement Tuesday.

"The incendiary news of the meeting arranged by Donald Trump Jr. is a grave development in the investigation of Trump officials' possible collusion with Moscow. In addition to Special Counsel Mueller's scrutiny, everyone at the meeting should be immediately summoned to appear under oath before the House and Senate committees investigating."

Calls for Trump Jr., Kushner, and Manafort to testify come after the New York Times reported this weekend the three men attended a meeting at Trump Tower last year with a Russian lawyer, Natalia Veselnitskaya, with the promise of receiving damaging information about Hillary Clinton.

The meeting was orchestrated by Rob Goldstone, a British publicist, and Trump Jr. posted to his Twitter account Tuesday a series of email exchanges he had with Goldstone about the meeting.

"The Crown prosecutor of Russia met with his father Aras this morning and in their meeting offered to provide the Trump campaign with some official documents and information that would incriminate Hillary and her dealings with Russia and would be very useful to your father," Goldstone wrote in his first email to Trump on June 3, 2016.

"This is obviously very high level and sensitive information but is part of Russia and its government's support for Mr. Trump," Goldstone continued.

After the New York Times' initial article Monday detailing the existence of Trump Jr.'s email exchange, a number of House and Senate Democrats began calling for the president's son to testify before Congress.

Trump Jr. said he would be willing to answer lawmakers' questions.

Others, such as Sen. Ron Wyden, D-Ore., a member of the Senate Intelligence Committee, said Trump Jr. made an "attempt at collusion" by meeting with Veselnitskaya.

Pelosi criticized Trump and his administration for its "shady Russian connections" and said the White House is "desperate to hide the truth."

"There's no escaping it: the Trump campaign's inner circle met with an agent of a hostile foreign power to influence the outcome of an American election. The American people face a White House riddled with shadowy Russian connections and desperate to hide the truth," she said.

Numerous congressional committees, including the House and Senate Intelligence Committees, are looking into ties between Trump campaign officials and the Kremlin, and whether the campaign colluded with Russia.

Robert Mueller, former FBI director, was appointed special counsel in May to lead the probe at the FBI into Russian meddling in the election.