Jeff Flake

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U.S. Sen. Jeff Flake, R-Arizona, shakes hands with a guest following an address in Manchester, N.H., Monday, Oct. 1, 2018. Flake, days after a critical vote in support of Supreme Court nominee Brett Kavanaugh, made his second visit this year to New Hampshire. The visit will once again stoke suggestions that he might run against President Trump in 2020. (AP Photo/Charles Krupa) (Associated Press)

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Sen. Jeff Flake, R-Ariz., a member of the Judiciary Committee, walks past members of the media as he heads to Senate Chamber floor on Capitol Hill in Washington, Tuesday, Sept. 18, 2018.(AP Photo/Pablo Martinez Monsivais)

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Rep. Kyrsten Sinema, Arizona Democrat, is running for retiring Sen. Jeff Flake's seat in the Senate.

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Sen. Jeff Flake, R-Ariz., answers a question as he speaks to members of the Glendale Chamber of Commerce Tuesday, May 30, 2017, in Glendale, Ariz. (AP Photo/Ross D. Franklin)

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Sen. Jeff Flake, R-Ariz., speaks at a Glendale Chamber of Commerce event Tuesday, May 30, 2017, in Glendale, Ariz. (AP Photo/Ross D. Franklin)

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Protesters march in front of a inflatable chicken as they protest in front of an event hosted by the Glendale Chamber of Commerce where Sen. Jeff Flake, R-Ariz., was speaking Tuesday, May 30, 2017, in Glendale, Ariz. (AP Photo/Ross D. Franklin)

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Sen. Jeff Flake, R-Ariz., speaks to members of the Glendale Chamber of Commerce Tuesday, May 30, 2017, in Glendale, Ariz. (AP Photo/Ross D. Franklin) ** FILE **

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Arizona Republican Sen. Jeff Flake tries to answer a question during a town hall Thursday, April 13, 2017, in Mesa, Ariz. Flake is holding his first public event with constituents since January after coming under withering criticism for his voting record and avoiding such gatherings in recent months. (AP Photo/Ross D. Franklin)

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An audience member reacts to Arizona Republican Sen. Jeff Flake as he answers a question during a town hall Thursday, April 13, 2017, in Mesa, Ariz. Flake is holding his first public event with constituents since January after coming under withering criticism for his voting record and avoiding such gatherings in recent months. (AP Photo/Ross D. Franklin)

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Arizona Republican Sen. Jeff Flake answers a question during a town hall Thursday, April 13, 2017, in Mesa, Ariz. Flake is holding his first public event with constituents since January after coming under withering criticism for his voting record and avoiding such gatherings in recent months. (AP Photo/Ross D. Franklin) ** FILE **

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An audience member shouts at Arizona Republican Sen. Jeff Flake during a town hall Thursday, April 13, 2017, in Mesa, Ariz. Flake is holding his first public event with constituents since January after coming under withering criticism for his voting record and avoiding such gatherings in recent months. (AP Photo/Ross D. Franklin)

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Arizona Republican Sen. Jeff Flake tries to answer a question during a town hall Thursday, April 13, 2017, in Mesa, Ariz. Flake is holding his first public event with constituents since January after coming under withering criticism for his voting record and avoiding such gatherings in recent months. (AP Photo/Ross D. Franklin)

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Sen. John McCain, (R-Ariz), left, speaks as Sen. Jeff Flake, (R-Ariz.), right, leaves a news conference on Capitol Hill after introducing the Veterans Choice Act, which would provide veterans "with greater flexibility and choice in health care providers and increasing accountability and transparency at the VA, Washington, D.C., Tuesday, June 3, 2014. (Andrew Harnik/The Washington Times)

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Sen. Richard Burr (R-N.C.), pictured, at a press conference with Sen. John McCain, (R-Ariz), Sen. Tom Coburn (R-Okla.), and Sen. Jeff Flake, (R-Ariz.) on Capitol Hill to introduce the Veterans Choice Act, which would provide veterans "with greater flexibility and choice in health care providers and increasing accountability and transparency at the VA, Washington, D.C., Tuesday, June 3, 2014. (Andrew Harnik/The Washington Times)

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Sen. John McCain, (R-Ariz), left, speaks as Sen. Jeff Flake, (R-Ariz.), center, and Sen. Richard Burr (R-N.C.), right, leave a news conference on Capitol Hill after introducing the Veterans Choice Act, which would provide veterans "with greater flexibility and choice in health care providers and increasing accountability and transparency at the VA, Washington, D.C., Tuesday, June 3, 2014. (Andrew Harnik/The Washington Times)