Rubio remotely blocks Mexico ambassador nominee while campaigning
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Sen. Marco RubioMarco Antonio RubioNikki Haley: New York Times ‘knew the facts’ about curtains and still released story March For Our Lives founder leaves group, says he regrets trying to 'embarrass' Rubio Rubio unloads on Turkish chef for 'feasting' Venezuela's Maduro: 'I got pissed' 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 UdallSenate Democrats increase pressure for FBI investigation of Kavanaugh Trump administration weakens methane pollution standards for drilling on public lands Senate Dems want DOJ review of Giuliani's work for foreign entities MORE (D-N.M.) tried to get unanimous consent to confirm Roberta Jacobson, who was nominated in June. Sen. Mike LeeMichael (Mike) Shumway LeeReexamining presidential power over national monuments Utah group complains Mia Love should face criminal penalties for improper fundraising Senate approves 4B spending bill 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 CruzPoll: Cruz leads O'Rourke by 3 in Texas Senate race Julián and Joaquin Castro to campaign with O'Rourke in Texas The Hill's 12:30 Report — Trump rips 'ridiculous' spending bill | FBI dragged into new fight | Latest on Maryland shooting MORE (R-Texas) blocked State Department nominees three times since last week over the Iran nuclear deal.