"I feel compelled to comment on how Republicans have treated the president of the United States during the last eight years," he said Thursday. "History will look back and note the Republicans in Congress treated President Obama with unprecedented disrespect."

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Reid's comments come as the Senate is expected to leave town until November, giving the outgoing Democratic leader one last chance to knock Republicans from the Senate floor before the elections.

He added Thursday that GOP lawmakers "have not done their basic work of government."

"They have not stood by their commitments to restore regular order or to pass a budget. Republicans have spent their time doing everything in their power to discredit President Obama and empower Donald Trump," he said.

Democrats need to pick up five seats in November — four if they retain the White House — to take control of the Senate. With Republicans defending 24 seats — including a handful in purple states previously carried by President Obama — Reid has repeatedly rushed to link GOP lawmakers to Trump, their presidential nominee.

Reid on Thursday double down on his frequent insult that Trump is the Republicans' "Frankenstein monster."

"The only thing Republicans have done this year was to prove that they are the party of Trump. They are the party of Trump," he said. "They would have us believe that Trump just fell out of the sky and somehow mysteriously became the nominee of the party, but that's not the way it is."