WATCH: Trump predicts $7-per-gallon gas under Biden, repeats unproven election claims

Former President Donald Trump touched on a number of hot-button issues in a TV interview late Tuesday, predicting gas topping out at $7 per gallon under the Biden administration, blasting the southern border crisis and calling wind "very, very expensive."

Importantly, Trump continued to push his unproven claims of fraud in the 2020 presidential election.

"The election was a fraud," he said. "It was a rigged election. When you look at what they did, it’s so illegal. I think things are happening at a very fast pace, much faster than people understand."

Trump made the comments in a wide-ranging conversation with Steve Cortes, a former adviser to the president, on Newsmax.

When asked about President Joe Biden’s handling of migrants coming into the United States, Trump revisited one of his most controversial lines from the launch of his presidential campaign in 2016: "They have rapists. They have murderers. They have drug dealers. They have human traffickers, and they traffic in women, which nobody likes to say. They have…the worst people anywhere in this hemisphere, in the world coming into this country unchecked. Being released in our country."

The former president teased a grim future under Biden, projecting "gasoline is going to stop at six, seven dollars, I think, based on what I’m seeing."

He shared his thoughts on wind energy, a big driver of the current administration’s agenda. "They ruin the environment, they kill the birds and they cost a fortune," Trump explained. "We have natural gas…costs us nothing. Actually nothing. They burn it off. When you look at all of those flames on top of the wells, that’s natural gas that they burn off. They throw (it) away…and we want to give that away for windmills."

"I’m not a big fan of wind. It’s very, very expensive," Trump added.

The would-be leading GOP nominee for president in 2024 also discussed the nation’s continuing battle against COVID-19, touching on vaccine hesitancy among many Americans, particularly Republicans.

"A lot of people (have been vaccinated), a lot of people are going to and we have some out there that don’t want to and that’s their freedom," he said. "I mean, that’s what it’s all about. That’s their freedom. I would recommend that they do it but that’s their freedom."

In March, Trump told his dedicated supporters, many of which are against being inoculated, to get the vaccine after pressure mounted on him to do so.

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