Outgoing Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.) jabbed at her colleagues in her final Senate floor speech on Thursday, arguing that the Senate was filled with "too many embarrassing uncles."

In her speech, McCaskill knocked "dysfunction" in the Senate and said senators were afraid of making tough votes.

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"Peter Morgan, an author, wrote that no family is complete without an embarrassing uncle," McCaskill said Thursday. "We have too many embarrassing uncles in the United States Senate. Lots of embarrassing stuff."

"The United States Senate is no longer the world's greatest deliberative body," McCaskill continued in her farewell address to the chamber. "And everybody needs to quit saying it, until we recover from this period of polarization and the fear of the political consequences of tough votes."

"We have too many embarrassing uncles in the United States Senate," Sen. McCaskill laments in her farewell speech. “Lots of embarrassing stuff.” pic.twitter.com/biw51aYuV4 — NBC News (@NBCNews) December 13, 2018

McCaskill delivered her farewell speech Thursday alongside other departing U.S. senators including Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) and Sen. Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (D-Fla.).

The two-term Missouri Democrat was denied a third term in November by Sen.-elect Josh Hawley Joshua (Josh) David HawleySenate GOP faces pivotal moment on pick for Supreme Court Renewed focus on Trump's Supreme Court list after Ginsburg's death What Facebook's planned change to its terms of service means for the Section 230 debate MORE (R), previously the state's attorney general, in a crucial pickup for Republicans who saw a net gain of two seats in the Senate during the midterm elections.

Hawley won the seat by 6 points after President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE previously won Missouri by roughly 18 points in the 2016 election.