Rubio remotely blocks Mexico ambassador nominee while campaigning
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Sen. Marco RubioMarco RubioLongtime GOP incumbent will not seek reelection Overnight Defense: Commander calls North Korea crisis 'worst' he's seen | Trump signs VA order | Dems push Trump to fill national security posts What’s with Trump’s spelling mistakes? 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 UdallDems blast Trump's policies at Climate March IT modernization bill reintroduced in Congress Overnight Energy: Trump orders review of national monuments, claiming ‘egregious abuse’ MORE (D-N.M.) tried to get unanimous consent to confirm Roberta Jacobson, who was nominated in June. Sen. Mike LeeMike LeeWhy is the State Department refusing to disclose Soros' involvement in Macedonia? What to know about Trump's national monuments executive order ObamaCare must be fixed before it collapses 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 CruzTed CruzKasich finds it hard to rule out 2020 Trump in campaign mode at NRA convention Trump’s hands are tied on 9th Circuit MORE (R-Texas) blocked State Department nominees three times since last week over the Iran nuclear deal.