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)

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. Ben Sasse (R-NE) speaks to reporters as he leaves 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)