Trump meets with James Baker in DC
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Donald TrumpDonald John TrumpZuckerberg launches public defense of Facebook as attacks mount Trump leaning toward keeping a couple hundred troops in eastern Syria: report Warren says making Israel aid conditional on settlement building is 'on the table' MORE met with former Secretary of State James Baker during his Thursday swing through Washington as the presumptive GOP presidential nominee seeks to unite the Republican Party behind him. 
The pair met during Trump's visit to Jones Day, the Washington law firm where many members of his legal team practice, NBC News reported.
The meeting came hours after Baker criticized some of Trump's key foreign policy proposals during a Thursday Senate hearing, including his call to roll back American involvement in the North Atlantic Treaty Organization (NATO). 
The criticism came after prodding by Sen. Marco RubioMarco Antonio RubioTurkey says soldier killed despite cease-fire in Syria White House staggers after tumultuous 48 hours Erdoğan got the best of Trump, experts warn MORE (R-Fla.), who battled with Trump during his own presidential run this cycle. 
Rubio asked Baker to "describe a world in which NATO lost its way or perhaps disintegrated," parroting Trump's criticism. 
"We've got a lot of problems today but you'd have a hell of a lot more if that was the case," Baker responded. "NATO has been the foundation and the base for peace and stability in Europe and on the Eurasian Continent."
Rubio also brought up Trump’s call to let Japan and South Korea obtain nuclear weapons, without explicitly mentioning the mogul. 
"The more countries that acquire nuclear weapons, the more instability there is going to be in the world," Baker said. 
"Ever since the end of World War II, America has led the fight on against the proliferation of nuclear weapons, weapons that can kill millions and millions of people. We ought not to abandon that fight."  
Baker's meeting with Trump came after a series of meetings with major party leaders, including Speaker Paul RyanPaul Davis RyanAmash: Trump incorrect in claiming Congress didn't subpoena Obama officials Democrats hit Scalia over LGBTQ rights Three-way clash set to dominate Democratic debate MORE and House leadership, as well as Senate leadership.