House Speaker Nancy Pelosi on Friday defended slow-walking impeachment despite pressure from liberal members of her caucus, arguing that Dems should wait until they had the “best, strongest possible case” against President Trump.

Progressives, including Big Apple Reps. Alexandria Ocasio-Cortez — with whom Pelosi met Friday — and Jerry Nadler, have pressured the 79-year-old speaker to launch impeachment proceedings against the president, but Pelosi said it made more sense to pursue legal action at this time.

“Mr. [Robert] Mueller said the other day, confirmed, confirmed in the public mind, that the president has obstructed justice. You know what he said. If he could have exonerated him, he would have. He didn’t,” she said during a Capitol news conference, referring to the former special counsel’s testimony to Congress on Wednesday.

“But he was not able to investigate the president’s finances, personal business or otherwise, and that is what we are doing in the courts. So I’m willing to take whatever heat there is to say the decision will be made in a timely fashion,” she continued.

“This isn’t endless. And when we have the best, strongest possible case” she could proceed, she said.

Nadler, chair of the Judiciary Committee that questioned Mueller on Wednesday, said he agreed with Pelosi that Dems needed to assemble the best case possible against the president — and praised the former special counsel as “a man of honor and integrity” whose findings laid the grounds for impeachment.

“He showed through his report and his indictments that the United States was attacked and remains under siege by a foreign adversary. He showed that the Trump campaign, both welcomed and benefited from this attack on our country,” he said, referring to Russian meddling.

“And he showed that the president repeatedly lied to cover it up. He told us that Donald Trump obstructed justice and abused his office by attempting to block the investigation and attempting to fire the special counsel,” he continued, adding that his committee wold pursue legal action against the president.

California Democratic Rep. Eric Swalwell said those who panned Mueller’s appearance because of his stoic and at times stumbling testimony were ignoring the substance of what he said.

“If you show up expecting a Broadway show sure you may have been disappointed. If you listen to what he said, he said the Russians attacked us. They had a preference for Donald Trump. The Trump campaign welcomed it and planned around it. When the [FBI] investigated it they took great lengths to cover it up,” he said.

The drive to impeach Trump stalled in the fractured House Democratic conference following Mueller’s testimony, which produced no new bombshells.

Pelosi opposes impeachment largely because a move to oust the president would be dead on arrival in the Republican-controlled Senate and could be a politically toxic issue for Democrats in swing districts.

Pelosi advised Democrats this week to talk about impeachment if they need to boost their re-election prospects next year — but not in a way that challenged other members’ opposition to launching an impeachment effort.

New York House Democrats are split — with 11 for impeachment and 10 against.