Jack Welch, the former GE chief and longtime Republican supporter, told CNBC on Tuesday he's voting for Donald Trump because he likes the real estate mogul's policies on tax reform, government regulations and national security more than those of Hillary Clinton.

Welch was late to the Trump camp, first supporting Texas Sen. Ted Cruz, who failed to secure the GOP presidential nomination.

In a "Squawk Box" interview, Welch provided a detailed argument for Trump's policies.

"I have no ax to grind with the Clintons. ... I'm supporting an agenda. It's Donald Trump's agenda, and I'm for it," he said. "I like starting here, and fighting like hell for it, because I know it will grow the economy 4 percent-plus."