Senate Minority Leader Charles Schumer Chuck SchumerDemocrats scramble on COVID-19 relief amid division, Trump surprise Pelosi, Schumer 'encouraged' by Trump call for bigger coronavirus relief package Schumer, Sanders call for Senate panel to address election security MORE (D-N.Y.) stressed Sunday that congressional approval is needed to enter a war, saying President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE’s decision to order the killing of Iranian Gen. Qassem Soleimani brought the U.S. closer to that possibility.

Schumer said on ABC’s “This Week” that he was concerned Trump’s decision will “get us into another endless war in the Middle East,” adding that the U.S. is “closer to that” because of his actions.

"I am really worried, and that is why Congress must assert itself," the Senate minority leader said, noting that the president does not have the authority to start a war without congressional approval.

“I think Congress and I will do everything I can to assert our authority,” he said. “We do not need this president either bumbling or impulsively getting us into a major war.”

Schumer said the president needed a check from Congress before making a decision that could lead to war and added that Trump’s foreign policy has been “erratic and unsuccessful thus far.”

He said the next steps are for the U.S. to determine what Iran’s ability to retaliate is and how the U.S. will prepare for it.

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The president approved a strike that killed Soleimani last week, resulting in Iran promising retaliation against the U.S. Several top lawmakers in Congress were not notified of the attack ahead of time.

Trump answered Iran’s threats of retaliation by saying the U.S. will hit 52 targets “very fast and very hard” if the country acts on its threats.