Corey Lewandowski said ahead of President Trump's highly anticipated announcement Tuesday that if Trump decides to end the Deferred Action for Childhood Arrivals (DACA) program it is because it is "unconstitutional."

"If the president does rescind this, it's because it's been unconstitutional. We know that for sure," Lewandowski, Trump's former campaign manager and ally, said during an interview on Fox News Monday.

"And it's the president's prerogative to inject in this," he continued. "But here's my concern — all of a sudden we're hearing from leaders in Congress who are saying, 'Oh Mr. President, give us the opportunity to act.' "

Lewandowski said Congress has had years to act on the issue.

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"We have no more time," he argued. "Congress has had chance after chance after chance to engage in this issue and they haven't done it."

Moving forward, Lewandowski said, the country needs a strong immigration policy.

A report Sunday said Trump has made a decision to end the DACA program with a six-month delay, allowing Congress an opportunity to take action to help those affected by the decision.

Trump has been weighing whether to end the Obama-era program, which temporarily shielded from deportation undocumented immigrations brought to the U.S. as minors.

Politico reported Sunday that the president discussed how to end DACA with top White House aides.

Lawmakers on both sides of the aisle have called on the president not to end the program.

Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) has said he thinks it's something Congress "has to fix."

Trump is expected to make a formal announcement Tuesday about the future of the program.