Cindy Hyde-Smith sworn in as Mississippi's latest senator
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Cindy Hyde-Smith (R) was sworn in on Monday to fill the seat vacated by former Sen. Thad CochranWilliam (Thad) Thad CochranBiden has a lot at stake in first debate The Hill's Morning Report — Trump turns the page back to Mueller probe Trump praises Thad Cochran: 'A real senator with incredible values' MORE (R-Miss.).  

Vice President Pence administered the oath on the Senate floor to Hyde-Smith, who was formerly Mississippi’s commissioner of Agriculture and Commerce.  

Fellow Mississippi Sen. Roger WickerRoger Frederick WickerHillicon Valley: Zuckerberg defends handling of misinformation in political ads | Biden camp hits Zuckerberg over remarks | Dem bill would jail tech execs for lying about privacy | Consumer safety agency accidentally disclosed personal data Overnight Defense — Presented by Boeing — Pence says Turkey agrees to ceasefire | Senators vow to move forward with Turkey sanctions | Mulvaney walks back comments tying Ukraine aid to 2016 probe On The Money: Senate fails to override Trump veto over border emergency | Trump resort to host G-7 next year | Senators to push Turkey sanctions despite ceasefire | McConnell tees up funding votes MORE (R) accompanied Hyde-Smith, as did GOP Sens. Orrin HatchOrrin Grant HatchTrump holds more Medal of Freedom ceremonies than predecessors but awards fewer medals Trump to award Medal of Freedom to former Attorney General Edwin Meese Trump to award racing legend Roger Penske with Presidential Medal of Freedom MORE (Utah), Lamar AlexanderAndrew (Lamar) Lamar AlexanderGOP braces for impeachment brawl McConnell tightlipped as impeachment furor grows GOP senator: 'Inappropriate' to discuss opponents, but impeachment a 'mistake' MORE (Tenn.) Susan CollinsSusan Margaret CollinsOvernight Energy: Perry to step down as Energy secretary | Future of big-game hunting council up in the air | Dems lose vote against EPA power plant rule Overnight Defense — Presented by Boeing — Pence says Turkey agrees to ceasefire | Senators vow to move forward with Turkey sanctions | Mulvaney walks back comments tying Ukraine aid to 2016 probe On The Money: Senate fails to override Trump veto over border emergency | Trump resort to host G-7 next year | Senators to push Turkey sanctions despite ceasefire | McConnell tees up funding votes MORE (Maine) and Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellWhite House staggers after tumultuous 48 hours The Memo: Trump's sea of troubles deepens McConnell: Trump's troop pull back in Syria a 'grave strategic mistake' MORE (Ky.), along with Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerTrump touts Turkey cease-fire: 'Sometimes you have to let them fight' Mattis responds to Trump criticism: 'I guess I'm the Meryl Streep of generals' Democrats vow to push for repeal of other Trump rules after loss on power plant rollback MORE (D-N.Y.).

Pence and Hyde-Smith are also expected to take part in a mock swearing-in from the old Senate chamber.

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Hyde-Smith was appointed to the Senate seat after Cochran resigned on April 1 following four decades in the chamber.

Cochran announced his decision to retire last month, saying his health had became an "ongoing challenge" and he wanted to step down with enough time to ensure a "smooth transition" to his successor.

Cochran, who ran the Appropriations Committee, marked the third Senate committee chairman to announce his decision to retire or resign this year. GOP Sens. Bob CorkerRobert (Bob) Phillips CorkerTrump's GOP impeachment firewall holds strong George Conway hits Republicans for not saying Trump's name while criticizing policy Trump announces, endorses ambassador to Japan's Tennessee Senate bid MORE (Tenn.) and Hatch, who oversee the Foreign Relations and Finance committees, respectively, are retiring after 2018.

Mississippi Gov. Phil Bryant (R) announced late last month that Hyde-Smith, a former Democrat who joined the GOP in 2010, would temporarily fill Cochran’s seat.

Hyde-Smith is the state’s first female senator and brings the total number of women in the Senate to 23 — an all-time high for the chamber.

Under Mississippi election law, a special election will be held in November for the remainder of Cochran’s term, which runs through 2020. If no one receives 50 percent of the vote, the top two candidates would then compete in a runoff.

Cochran’s retirement has shaken up Mississippi’s political scene.

Chris McDaniel, a conservative firebrand who unsuccessfully challenged Cochran in 2014, was running against Wicker in this year’s midterms but announced in March that he will run for Cochran’s seat instead.

Republicans are growing concerned that Cochran’s retirement could threaten their ability to keep his seat in the “R” column.

Hyde-Smith has close ties to the Trump administration and was reportedly considered for the role of Agriculture secretary after serving as a co-chair on President TrumpDonald John TrumpPelosi arrives in Jordan with bipartisan congressional delegation Trump says his Doral resort will no longer host G-7 after backlash CNN's Anderson Cooper mocks WH press secretary over Fox News interview MORE's Agriculture Advisory Committee during his presidential campaign.

But White House officials reportedly told Bryant that Trump would not endorse Hyde-Smith if she runs in November, fearing her past as a Democrat could be a ballot box liability.

Internal Republican polling showed Hyde-Smith behind both McDaniel and a Democratic candidate.