Rep. Adam Schiff, D-Calif., Chairman of the House Intelligence Committee, right, accompanied by House Speaker Nancy Pelosi of Calif., left, speaks about the House impeachment inquiry into President Donald Trump at a news conference on Capitol Hill in Washington, Tuesday, Oct. 15, 2019. (AP Photo/Andrew Harnik)

WASHINGTON (AP) — House Democrats are showing no signs of easing up on the fast-moving impeachment inquiry targeting President Donald Trump.

Lawmakers attending closed-door interviews say testimony from State Department officials and those in other foreign policy posts is largely corroborating the account of the government whistleblower whose complaint sparked the probe.

House Speaker Nancy Pelosi appears not to be willing to give in to Republican demands for a formal vote on the impeachment inquiry.

Pelosi told reporters Tuesday that the investigation is raising new questions about Trump's relationship with Russia's president, Vladimir Putin. She says that with Trump, "all roads seem to lead to Putin."

Trump calls the impeachment inquiry an "illegitimate process."

Scheduled to appear on Wednesday is a former top aide to Secretary of State Mike Pompeo, Michael McKinley.

Deputy Assistant Secretary of State George Kent, second from right, arrives to appear before a joint House Committee on Foreign Affairs, Permanent Select Committee on Intelligence, and Committee on Oversight and Reform for a deposition on Capitol Hill in Washington, Tuesday, Oct. 15, 2019. (AP Photo/Manuel Balce Ceneta)
Former White House advisor on Russia, Fiona Hill, leaves Capitol Hill in Washington, Monday, Oct. 14, 2019, after testifying before congressional lawmakers as part of the House impeachment inquiry into President Donald Trump. (AP Photo/Manuel Balce Ceneta)
House Speaker Nancy Pelosi of Calif., speaks at a news conference on the House impeachment inquiry into President Donald Trump on Capitol Hill in Washington, Tuesday, Oct. 15, 2019. (AP Photo/Andrew Harnik)
Deputy Assistant Secretary of State George Kent, center, arrives on Capitol Hill in Washington, Tuesday, Oct. 15, 2019, as he is scheduled to testify before congressional lawmakers as part of the House impeachment inquiry into President Donald Trump. (AP Photo/Andrew Harnik)