President Donald Trump takes his midterm campaign blitz to Texas, where Senate candidate Ken Paxton is locked in a tight race against Democrat James Talarico.

And Secretary of State Marco Rubio will join Trump to show off a newly arrived oil tanker filled with Venezuelan crude to be processed in Texas refineries, according to a congressional aide and two U.S. officials.

Meanwhile, the Iran war, which Trump often describes as a "little detour," has emerged as an unforced liability for a president who promised to keep the U.S. out of foreign wars.