Rubio remotely blocks Mexico ambassador nominee while campaigning
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Sen. Marco RubioMarco Antonio RubioRyan pledges 'entitlement reform' in 2018 Richard Gere welcomes lawmakers' words of support for Tibet Dem lawmaker gives McConnell's tax reform op-ed a failing grade 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 UdallThomas (Tom) Stewart UdallAvalanche of Democratic senators say Franken should resign Dem senator slams Trump's 'moral authority' after 'Pocahontas' remark Overnight Cybersecurity: Kushner was contacted about WikiLeaks before election | Tech experts blast Trump's 'extreme vetting' plan | Senate passes defense bill with measure to modernize feds' IT MORE (D-N.M.) tried to get unanimous consent to confirm Roberta Jacobson, who was nominated in June. Sen. Mike LeeMichael (Mike) Shumway LeeSupreme Court takes on same-sex wedding cake case House approves motion to go to tax conference — with drama Trump really will shrink government, starting with national monuments 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 CruzDebbie Wasserman Schultz marks 10 years as breast cancer survivor Foreign agent registration is no magical shield against Russian propaganda Let Trump be Trump and he'll sail through 2020 MORE (R-Texas) blocked State Department nominees three times since last week over the Iran nuclear deal.