Sen. Amy Klobuchar, D-Minn., on Tuesday called for former special counsel Robert Mueller to testify before the House as Democratic lawmakers continue to move forward with an investigation on obstruction of justice allegations against President Donald Trump.

Klobuchar, a 2020 Democratic presidential candidate, is one of the first Oval Office hopefuls to declare Mueller should testify since his rare public statement last week about the findings from his Russia probe.

"I think he should go before the House," Klobuchar said during an interview on MSNBC, adding that lawmakers will likely ask first, but "could also use a subpoena."

Democratic lawmakers over the past several days have called for Mueller to testify about his investigation into Russia's interference in the 2016 presidential election, which also touched on possible obstruction of justice by Trump.

House Majority Leader Steny Hoyer during a press conference Tuesday said he believes Mueller "ought to testify."

"He may want a subpoena, for all I know," Hoyer, D-Maryland, said.

Mueller last week gave a press conference where he publicly defended the findings from his report on the Russia investigation. He also resigned from his position as special counsel and said he would not testify before Congress.

"Any testimony from this office would not go beyond our report...the work speaks for itself," Mueller said during the press conference.

House Intelligence Committee Chairman Adam Schiff, D-Calif., following Mueller's announcement last week also said in a statement that lawmakers "look forward to Mueller’s testimony before Congress."

"While I understand his reluctance to answer hypotheticals or deviate from the carefully worded conclusions he drew on his charging decisions, there are, nevertheless, a great many questions he can answer that go beyond the report..." Schiff said.

During his public statement, Mueller did not clear Trump of any criminal wrongdoing with regard to obstruction of justice. And, the former special counsel laid out why he could not bring charges against the president.

"If we had confidence that the president clearly did not commit a crime, we would have said that," Mueller said, adding that investigators were essentially blocked by long-standing Justice Department policy that prohibits the criminal prosecution of sitting presidents.

"A president cannot be charged with a federal crime while he is in office. That is unconstitutional," Mueller said.

Since Mueller's statement, dozens of Democratic lawmakers, including many 2020 presidential candidates, have said an impeachment inquiry against the president should be opened. House Speaker Nancy Pelosi, however, has repeatedly advocated to hold off on impeachment to build a case against the president.

Klobuchar sits on the Senate Judiciary Committee, and is part of the chamber that would serve as the jury in a trial on any articles of impeachment passed by the House, if it were to impeach Trump

House lawmakers have repeatedly tried to subpoena multiple former and current Trump administration officials to no avail.

The House Judiciary Committee has asked Attorney General William Barr and former White House counsel Don McGahn to testify before the panel, but both have declined.

Klobuchar said she thinks the House must continue to conduct its investigation.

"I think it's really important that there be accountability, this investigation continues and that means both Barr testify before the House, not just the Senate, as well as, of course, Bob Mueller appearing before both bodies, but the House has the power to subpoena him," Klobuchar said.