Rubio remotely blocks Mexico ambassador nominee while campaigning
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Sen. Marco RubioMarco RubioWhat Trump's Cabinet picks reveal House passes water bill with Flint aid, drought relief What the 2016 election can tell us about 2018 midterms 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 UdallStaff shakeup begins at Dem campaign committee Tom Udall eyes NM governor bid Court ruling could be game changer for Dems in Nevada MORE (D-N.M.) tried to get unanimous consent to confirm Roberta Jacobson, who was nominated in June. Sen. Mike LeeMike LeeSenate sends annual defense bill to Obama's desk Overnight Healthcare: Medical cures bill finally heads to White House Overnight Energy: Trump taps EPA foe to head agency | Energy reform bill officially dead 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 CruzCruz, DeSantis to introduce constitutional amendment on term limits Fiorina to meet with Trump on Monday Trump picks Goldman Sachs chief for top economic adviser: report MORE (R-Texas) blocked State Department nominees three times since last week over the Iran nuclear deal.