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Claire McCaskill: Ron Johnson is an 'embarrassing tool'

Former Sen. Claire McCaskillClaire Conner McCaskillDemocrats must turn around Utah police arrest man driving 130 mph claiming he was going to kill former Missouri senator McCaskill congratulates Hawley on birth of daughter MORE (D-Mo.) lambasted her former colleague Sen. Ron JohnsonRonald (Ron) Harold JohnsonLoeffler isolating after possible COVID-19 infection Rick Scott tests positive for coronavirus GOP Rep. Dan Newhouse tests positive for COVID-19 MORE (R-Wis.) Tuesday morning on MSNBC's "Morning Joe," calling him an "embarrassing tool."

"Morning Joe" co-host Joe ScarboroughCharles (Joe) Joseph ScarboroughFox News wins ratings week, while MSNBC touts daytime figures Scarborough: Putin more likely to take tough question than Trump Michael Keaton urges Biden not to debate Trump again: 'You won. Walk away' MORE was talking about how President TrumpDonald John TrumpBiden team wants to understand Trump effort to 'hollow out government agencies' Trump's remaking of the judicial system Overnight Defense: Trump transgender ban 'inflicts concrete harms,' study says | China objects to US admiral's Taiwan visit MORE has continued to shake the hands of supporters, despite the recommendations from his coronavirus task force not to do so, when McCaskill steered the conversation to another topic: Johnson and his committee's investigation into Hunter Biden, the son of former Vice President Joe BidenJoe BidenBiden team wants to understand Trump effort to 'hollow out government agencies' Overnight Defense: Trump transgender ban 'inflicts concrete harms,' study says | China objects to US admiral's Taiwan visit Protect our world: How the Biden administration can save lives and economies worldwide MORE.

“Allow me to pop off on Ron Johnson here. What a joke! What an embarrassing tool!" she told Scarborough.

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"He is chairman of the Homeland Security Committee! Right? He has jurisdiction over coronavirus and the federal response. Is he calling a hearing? Is he trying to figure out why first responders’ tests aged on a shelf in the state of Washington until they were no longer good? Is he going to tell people why they can’t get the test? No," she continued.

"Even though it's not in his committee’s jurisdiction — the Judiciary Committee is not issuing subpoenas on Hunter Biden. The Foreign Affairs Committee is not issuing subpoenas on Hunter Biden. No! This joke, Ron Johnson, is actually politicizing a committee that right now should have one focus: What is going on with the United States of America’s federal response to the coronavirus? People should be really angry about this," McCaskill added.

On Monday, Johnson, chairman of Senate Homeland Security and Governmental Affairs Committee, signaled that he would move forward with a vote this week on a subpoena that is related to his investigation into Hunter Biden and the Ukrainian gas company Burisma Holdings. Senate Democrats have openly opposed the probe and subpoena, but it is expected that the measure to authorize the subpoena will pass.

"We have conducted our investigations methodically, responsibly, and largely out of public view," Johnson wrote to committee ranking member Gary PetersGary PetersLeadership changes at top cyber agency raise national security concerns Hillicon Valley: Peters criticizes deficient healthcare cybersecurity investment | Apple defends delay of data privacy feature | Children groups warn about Parler Peters criticizes Trump for not taking action after cyberattacks on hospitals, COVID-19 researchers MORE (D-Mich.) in a letter, which was released on Monday. "We have gone to great lengths to receive briefings and review and verify all information received by the Committee before making any of it public.

Peters has asked for the committee to receive a classified briefing regarding the subject of the subpoena from the FBI before voting on the subpoena. However, the voted is scheduled for Wednesday.