Former Texas Congressman Ron Paul has joined the chorus of those saying they will never support Donald Trump as the GOP nominee.

"I couldn't do that," the 2012 presidential candidate said of backing the New York billionaire during Fox Business interview Friday morning.

"[Trump] is opposite of a libertarian," he added.

Paul was the presidential nominee of the Libertarian Party in 1988, but ran as a Republican in both 2008 and 2012. The committed isolationist expressed concern Friday that Trump's foreign policy varies little from that of Democratic presidential front-runner Hillary Clinton, and that the businessman would frequently partake in executive overreach.

"I think the die-hard neoconservatives would not be that extremely unhappy with Hillary," Paul said, comparing the former secretary of state to Trump.

He continued, "Trump is going to be the most efficient [at] using the executive orders. He'll say this is the way it is, you know."

"Obama was pretty arrogant: 'If you don't do it, Congress, I'll write an order,' " Paul said, mimicking the president. "Well, I think Trump [will] be 10 times worse on writing orders because he's used to doing this, and he brags about it.

"He wants to be the boss. I'm not looking for a boss. We want somebody that will allow us to be our own boss, is what I think we should be looking for," Paul said.

Paul is the latest political figure to declare his opposition to Trump. Others, who've begun billing themselves as #NeverTrump conservatives, include Nebraska Sen. Ben Sasse, conservative commentator Erick Erickson and veteran GOP strategist Rick Wilson.