Some House Democrats renewed calls for Congress to impeach President Trump on Tuesday after he resorted to blaming "both sides' for a violent rally in Charlottesville, Va., this past weekend organized by white nationalist groups.

"POTUS is showing signs of erratic behavior and mental instability that place the country in grave danger," said Rep. Jackie Speier, D-Calif., in a tweet Tuesday night. "Time to invoke the 25th Amendment."

POTUS is showing signs of erratic behavior and mental instability that place the country in grave danger. Time to invoke the 25th Amendment. — Jackie Speier (@RepSpeier) August 16, 2017

Rep. Gwen Moore, D-Wis., also called on Republicans to initiate impeachment proceedings against Trump.

"As we once again hear Donald J. Trump defend those responsible for the deadly riot in Charlottesville and receive praise by hate groups like the KKK and neo-Nazis, the time has come for Republicans and Democrats to put aside our political differences and philosophical debates for a higher cause," Moore said in a statement.

"For the sake of the soul of our country, we must come together to restore our national dignity that has been robbed by Donald Trump's presence in the White House. My Republican friends, I implore you to work with us within our capacity as elected officials to remove this man as our commander-in-chief and help us move forward from this dark period in our nation's history."

My Republican friends, I implore you to work w/ us within our capacity as elected officials to remove @realDonaldTrump as #POTUS. #Impeach45 pic.twitter.com/l2KzKjUZtk — Rep. Gwen Moore (@RepGwenMoore) August 15, 2017

The impeachment push is not new for some Democrats.

Rep. Brad Sherman, D-Calif., earlier this summer introduced an article of impeachment accusing Trump of obstruction of justice and alleging he interfered with the ongoing federal investigation into Russia's meddling in the 2016 election.

The only other lawmaker who signed onto the bill is Rep. Al Green, D-Texas, who has also called for Trump's impeachment.

A new push by Democrats for removing the president from office comes after Trump reverted Tuesday to his original perspective on the Charlottesville rally, equating the actions of white supremacists there with counter-protesters, some representing left wing groups.

He told reporters at Trump Tower the media has not sufficiently criticized "alt-left" groups that also participated in the Charlottesville rally.

Under political pressure, Trump on Monday singled out "KKK, neo-Nazis, white supremacists and other hate groups" for condemnation, after neglecting to name the groups in his initial statement on Saturday.

But on Tuesday, he said there are "fine people" on both sides, along with some "bad people."

One woman, Heather Heyer, was killed during the rally and another 19 were injured when a 20-year-old man plowed his car into the group of people protesting the white nationalists.

The man, identified as James Alex Fields, a suspected Nazi sympathizer, was arrested and charged with second-degree murder.