Rubio remotely blocks Mexico ambassador nominee while campaigning
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Sen. Marco RubioMarco Antonio RubioLawmakers press Biden admin to send more military aid to Ukraine I'm furious about Democrats taking the blame — it's time to fight back The Hill's 12:30 Report: Djokovic may not compete in French Open over vaccine requirement MORE (R-Fla.) on Thursday remotely blocked the Senate from confirming President Obama's ambassador to Mexico, even though he is campaigning in South Carolina.

Sen. Tom UdallTom UdallCruz to get Nord Stream 2 vote as part of deal on Biden nominees Democrats threaten to play hardball over Cruz's blockade Rubio vows to slow-walk Biden's China, Spain ambassador nominees MORE (D-N.M.) tried to get unanimous consent to confirm Roberta Jacobson, who was nominated in June. Sen. Mike LeeMichael (Mike) Shumway LeeSenate panel advances bill blocking tech giants from favoring own products Schumer ramps up filibuster fight ahead of Jan. 6 anniversary Juan Williams: The GOP is an anti-America party MORE (R-Utah) objected, noting that he was doing so on behalf of Rubio, a GOP presidential candidate.

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Jacobson, who is currently the State Department's assistant secretary for Western Hemisphere affairs, has drawn flack from Republicans and some Democrats over her role in leading the Obama administration's negotiations with Cuba to restore relations. 
 
Rubio has repeatedly criticized the president's handling of the island country, suggesting Obama is relaxing decades-old travel and trade rules without requiring political or human rights reforms in return. 
 
He also wrote a letter to Jacobson last month about reports that a Hellfire missile was sent to Cuba after being used during a European training exercise. 
 
"The fact that the administration, including you, have apparently tried to withhold this information from the congressional debate and public discussion over U.S.-Cuba policy is disgraceful," he said at the time. 
 
A State Department official said Congress was briefed on the issue in February 2015.
 
Udall, separately, defended Jacobson, calling her a "highly qualified career nominee." 
 
"She's ready to serve. She has solid support on both sides of the aisle," he said.
 
Rubio isn't the only 2016 GOP presidential candidate that has recently blocked Obama's nominees. Sen. Ted CruzRafael (Ted) Edward CruzSenate panel advances bill blocking tech giants from favoring own products Lawmakers press Biden admin to send more military aid to Ukraine On The Money — Ban on stock trading for Congress gains steam MORE (R-Texas) blocked State Department nominees three times since last week over the Iran nuclear deal.