Claire McCaskill: Ron Johnson is an 'embarrassing tool'

Former Sen. Claire McCaskillClaire Conner McCaskillTrump mocked for low attendance at rally Missouri county issues travel advisory for Lake of the Ozarks after Memorial Day parties Senate faces protracted floor fight over judges amid pandemic safety concerns MORE (D-Mo.) lambasted her former colleague Sen. Ron JohnsonRonald (Ron) Harold JohnsonSenate GOP hedges on attending Trump's convention amid coronavirus uptick Koch-backed group urges Senate to oppose 'bailouts' of states in new ads Romney, Collins, Murkowski won't attend GOP convention MORE (R-Wis.) Tuesday morning on MSNBC's "Morning Joe," calling him an "embarrassing tool."

"Morning Joe" co-host Joe ScarboroughCharles (Joe) Joseph ScarboroughThe Hill's Morning Report - Trump lays low as approval hits 18-month low Cheney clashes with Trump Trump dings CNN, 'Morning Joe' ratings as Tucker Carlson sets record MORE was talking about how President TrumpDonald John TrumpIvanka Trump pitches Goya Foods products on Twitter Sessions defends recusal: 'I leave elected office with my integrity intact' Former White House physician Ronny Jackson wins Texas runoff 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 campaign slams Trump's Rose Garden event as 'sad affair' New shutdowns add to Trump woes CNN cuts away from Trump's 'campaign-type' Rose Garden speech 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 Charles PetersConservative group launches ad campaign for Rep. Roger Marshall in Kansas Senate race Health care group launches M ad campaign hitting Trump in battleground states The Hill's Morning Report - Presented by Facebook - Trump wants schools to reopen, challenged on 'harmless' COVID-19 remark 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.