GOP senators request details on Hunter Biden's travel for probe

Republican Sens. Chuck GrassleyCharles (Chuck) Ernest GrassleySenators demand more details from Trump on intel watchdog firing Democrats target Ernst in bid to expand Senate map Zoom, grocery delivery, self-isolation: How lawmakers are surviving coronavirus MORE (Iowa) and Ron JohnsonRonald (Ron) Harold JohnsonRemembering Tom Coburn's quiet persistence Coronavirus pushes GOP's Biden-Burisma probe to back burner GOP seeks up to 0 billion to maximize financial help to airlines, other impacted industries MORE (Wis.) are requesting details on the travel records for former Vice President Joe BidenJoe BidenThe Hill's Campaign Report: Sanders exits, clearing Biden's path to nomination Former Clinton staffers invited to celebrate Sanders dropping out: report Sanders exit leaves deep disappointment on left MORE's son Hunter Biden as they turn their focus past the impeachment trial.

Grassley and Johnson — the chairmen of the Senate Finance and Homeland Security and Governmental Affairs committees, respectively — sent a letter to Secret Service Director James Murray saying they were requesting the documents as part of a probe into "potential conflicts of interest posed by the business activities of Hunter Biden and his associates during the Obama administration."

"We write to request information about whether Hunter Biden used government-sponsored travel to help conduct private business, to include his work for Rosemont Seneca and related entities in China and Ukraine," the two senators added.

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As part of their request, the senators specifically want to know what sort of security detail Hunter Biden received while his father served as vice president, and a list of all dates and places Hunter Biden traveled with a protective detail.

They specifically want to know if he traveled on Air Force One or Air Force Two, the presidential and vice presidential aircraft, or on another government aircraft and whether additional family members were present for each trip.

The letter is the latest signal from Senate Republicans that they will step up their efforts to probe the Bidens, who have emerged as a top target for President TrumpDonald John TrumpSenators demand more details from Trump on intel watchdog firing Overnight Health Care: Trump steps up attack on WHO | Fauci says deaths could be lower than first projected | House panel warns federal stockpile of medical supplies depleted | Mnuchin, Schumer in talks over relief deal Trump says he'll look into small business loan program restricting casinos MORE and his allies as Joe Biden seeks the Democratic presidential nomination this year.

Senate Judiciary Committee Chairman Lindsey GrahamLindsey Olin GrahamTrump attacks WHO amid criticism of his coronavirus response Graham backs Trump, vows no money for WHO in next funding bill UN biodiversity chief calls for international ban of 'wet markets' MORE (R-S.C.) has also pledged to do oversight of Hunter Biden.

Trump's efforts to get Ukraine to launch investigations into his political rivals, including the Bidens, were at the center of the monthslong impeachment effort that ended in the Senate on Wednesday.

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Congressional investigators focused on Trump’s decision to delay Ukraine aid, which was eventually released in September, and a July 25, 2019 phone call with Ukrainian President Volodymyr Zelensky during which Trump asked Zelensky to work with his personal attorney Rudy GiulianiRudy GiulianiThe Hill's Morning Report - Presented by Facebook - Trump: Tough times but progress being made Giuliani touts experimental coronavirus treatment in private conversations with Trump Trump team picks fight with Twitter, TV networks over political speech MORE to “look into” the Bidens.

Republicans have targeted Hunter Biden over his time serving on the board of Ukrainian energy company Burisma while his father served as vice president.

In 2016, Joe Biden pushed for the dismissal of Ukrainian Prosecutor General Viktor Shokin because of concerns he was overlooking corruption in his own office, though Trump and his GOP allies have sought to tie the move to Hunter Biden's business interests.

Fact-checkers have debunked GOP claims that Joe Biden was acting with his son's interest in mind, and the former vice president has denied wrongdoing.

Kurt VolkerKurt VolkerGOP senators request details on Hunter Biden's travel for probe Yovanovitch retires from State Department: reports Live coverage: Senators enter second day of questions in impeachment trial MORE, the former U.S. envoy to Ukraine, told House lawmakers in November that Biden "was representing U.S. policy at the time" when he called for the prosecutor's dismissal.