India, Sept. 10 -- President Donald Trump's departure to Texas for the first-ever GOP midterm convention was briefly delayed on Wednesday. An emergency evacuation slide unexpectedly deployed on the Qatar-gifted Air Force One aircraft moments before he was due to board.

Videos from the Joint Base Andrews in Maryland showed the emergency slide deployed on one side of the Boeing 747 shortly before Trump was scheduled to board for Dallas.

After landing at the base, Trump acknowledged the delay and gestured to Marine One while addressing the media. He said, "They're checking the slide over here, and I think it's going to take 15 minutes."

The president remained aboard Marine One for about 20 minutes before stepping onto the tarmac. When ask...