"It was largely the fact that we don't want our people, like Vice President Biden and his son, creating to the corruption already in the Ukraine," Trump said as he left the White House for a trip to Texas.
"He has been durable," said David Axelrod, a longtime political strategist for President Barack Obama. "The question is whether that durability is because we aren't fully geared into the race or whether there are inherent strengths there."
Former Vice President Joe Biden on Saturday apologized for recent comments about working with segregationist senators in his early days in the U.S. Senate, saying he understands now his remarks could have been offensive to some.
President Donald Trump and Democrat Joe Biden spent Tuesday trading insults — sometimes almost simultaneously— as they stumped across Iowa in split-screen moments that could preview a ferocious fight ahead if the two face off for the presidency next year.