Donald Trump is becoming "self-impeachable" due to his administration's repeated obstruction of congressional investigations, Nancy Pelosi has said.

"The president is goading us, wants to goad us into impeachment because he knows, as do I, that that's not good for the country," the Democratic House speaker said on Wednesday during a live-streamed interview with the Washington Post.

Noting the administration was "ignoring subpoenas", she added: "Every day the president is making a case, he's becoming self-impeachable in terms of some of the things he's doing."

It came the day after she first alleged the president was "taunting" Democrats into launching impeachment proceedings because "he just wants to solidify his base".

Ms Pelosi has repeatedly tried to tamper discussions of impeachment, branding the subject as divisive to the country and going so far as to say Mr Trump was "just not worth it".

But the veteran congresswoman appears to be growing increasingly frustrated with the White House's stonewalling of Congress in its attempts to gain access to financial documents relating to Mr Trump and the unredacted Mueller report.