Claire McCaskill: Ron Johnson is an 'embarrassing tool'

Former Sen. Claire McCaskillClaire Conner McCaskillLobbying world Ex-Rep. Akin dies at 74 Republicans may regret restricting reproductive rights MORE (D-Mo.) lambasted her former colleague Sen. Ron JohnsonRonald (Ron) Harold JohnsonWisconsin senators ask outsiders not to exploit parade attack 'for their own political purposes' It's time to bury ZombieCare once and for all Marjorie Taylor Greene introduces bill to award Congressional Gold Medal to Rittenhouse MORE (R-Wis.) Tuesday morning on MSNBC's "Morning Joe," calling him an "embarrassing tool."

"Morning Joe" co-host Joe ScarboroughCharles (Joe) Joseph ScarboroughScarborough pleads with Biden to mandate vaccines for teachers, health workers Trump ramps up attacks on media Scarborough hosts critical race theory debate on 'Morning Joe' MORE was talking about how President TrumpDonald TrumpOmar, Muslim Democrats decry Islamophobia amid death threats On The Money — Powell pivots as inflation rises Trump cheers CNN's Cuomo suspension 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 BidenCDC working to tighten testing requirement for international travelers On The Money — Powell pivots as inflation rises Overnight Energy & Environment — Presented by ExxonMobil — Manchin seeks 'adjustments' to spending plan 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 PetersFive ways Senate could change Biden's spending plan Overnight Defense & National Security — Presented by Boeing — US mulls Afghan evacuees' future Senators look to defense bill to move cybersecurity measures 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.