Jeb Bush on Wednesday said he's changed his campaign tactics some in the wake of constant pressure from fellow GOP candidate Donald Trump, but his message still remains one of "hope and optimism."
"At some point, if you're being defined by a guy that can make a phone call and get on talk shows all the time and disparage you, you've got to fight back," the former Florida governor told Fox News' "Fox and Friends" show.
"We're on the verge of the greatest time to be alive."
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Bush was one of the first guests on Stephen Colbert's new "Late Show" on Tuesday night, and told Fox about one of the gags Colbert, who poked fun at Trump often on the show, played with Bush.
"He played Donald Trump," said Bush Wednesday. "I was surprised he put yellow cotton candy on his head and ate his own hair and asked if I wanted some. I took a piece of the Donald's hair."
Also on Wednesday, Bush discussed the issues Democratic frontrunner Hillary Clinton is having with her email server, saying that she has "not been truthful" and the news of the emails were found out through a subpoena.
"It damaged her campaign," said Bush. "Now there's all these investigations, FBI, Justice Department. You've got to be transparent running for office."
Bush said he's released 33 years of his own tax returns, and is releasing a book in October about his 10 years in office, based on his emails.
He also thinks it's a "great possibility" that Clinton's private email server was hacked, which was a "real problem" for national security.
"This administration has been lax when it comes to cyber security," said Bush. "They didn't create a secure situation, as 23 or 22 million personnel files are in the hands of Chinese government."
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