US Senators Bob Corker (R) and Jeff Sessions leave after a meeting with US Senate Republicans and US Republican presidential candidate Donald Trump at the National Republican Senatorial Committee (NRSC) headquarters on July 7, 2016, in Washington, DC. / AFP PHOTO / MOLLY RILEYMOLLY RILEY/AFP/Getty Images

US Senator Bob Corker (R-TN) answers questions from the press after the US Senate Republicans met with US Republican presidential candidate Donald Trump at the National Republican Senatorial Committee (NRSC) headquarters on July 7, 2016, in Washington, DC. / AFP PHOTO / MOLLY RILEYMOLLY RILEY/AFP/Getty Images

WASHINGTON, DC - JULY 07: Members of the press wait outside of the Republican National Senatorial Committee as Senate Republicans meet with Republican presidential candidate Donald Trump on July 7, 2016 in Washington, DC. Mr. Trump and the senators met in an attempt to unify ahead of the upcoming Republican national convention. (Photo by Zach Gibson/Getty Images)

WASHINGTON, DC - JULY 07: Sen. Bob Corker (R-TN) speaks to the press following a meeting with Republican presidential candidate Donald Trump at the Republican National Senatorial Committee on July 7, 2016 in Washington, DC. Mr. Trump and the senators met in an attempt to unify ahead of the upcoming Republican national convention. (Photo by Zach Gibson/Getty Images)

WASHINGTON, DC - JULY 07: Sen. David Perdue (R-GA) speaks to the press following a meeting with Republican presidential candidate Donald Trump at the Republican National Senatorial Committee on July 7, 2016 in Washington, DC. Mr. Trump and the senators met in an attempt to unify ahead of the upcoming Republican national convention. (Photo by Zach Gibson/Getty Images)

WASHINGTON, DC - JULY 07: Sen. Bob Corker (R-TN) speaks to the press following a meeting with Republican presidential candidate Donald Trump at the Republican National Senatorial Committee on July 7, 2016 in Washington, DC. Mr. Trump and the senators met in an attempt to unify ahead of the upcoming Republican national convention. (Photo by Zach Gibson/Getty Images)

WASHINGTON, DC - JULY 07: Sen. Bob Corker (R-TN) speaks to the press following a meeting with Republican presidential candidate Donald Trump at the Republican National Senatorial Committee on July 7, 2016 in Washington, DC. Mr. Trump and the senators met in an attempt to unify ahead of the upcoming Republican national convention. (Photo by Zach Gibson/Getty Images)

WASHINGTON, DC - JULY 07: Sen. Deb Fischer (R-NE), front, and Sen. Susan Collins (R-ME), back, leave a meeting with Republican presidential candidate Donald Trump at the Republican National Senatorial Committee on July 7, 2016 in Washington, DC. Mr. Trump and the senators met in an attempt to unify ahead of the upcoming Republican national convention. (Photo by Zach Gibson/Getty Images)