Sen. Bob Corker (R-TN) says Donald Trump is "evolving in his knowledge" of national security issues but will not say if he's "comfortable" with Trump as commander-in-chief. Corker talks to Chuck Todd ahead of NBC's Commander-in-Chief Forum.Sept. 7, 2016
UP NEXT
Lawrence: Gagged Trump's jury pool attacks are a big problem for his lawyers
09:52
Embattled Mike Johnson kept in check by conservative House 'FART' team
03:34
Bill Barr latest craven Republican to lose spine, back Trump despite criticism
08:02
Trump antics already backfiring on his criminal defense as no one trusts him to behave
07:50
Reports of explosions in Iran, no comment from U.S. or Israel
08:35
'No safer place than jail': Trump should be 'incarcerated' for gag order breaches legal expert says