Get breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.

WASHINGTON — Sen. Elizabeth Warren, D-Mass., raised the prospect Sunday that President Donald Trump's decision to authorize last week's attack on a top Iranian general may have been linked to his pending impeachment trial in the Senate.

"Next week, Donald Trump faces the start, potentially, of an impeachment trial," Warren, a Democratic presidential candidate, said in an interview on "Meet the Press."

"People are starting to ask, why now did he do this? Why not delay? And why this one is so dangerous is that he is truly taking us right to the edge of war. And that is something that puts us at risk. It puts the Middle East at risk. It puts the entire world at risk."

Warren also connected the U.S. operation to Trump's call with the president of Ukraine, which is at the center of the impeachment debate. She argued that during the call, Trump was "advancing his own personal political interest," and she questioned whether political concerns also shaped Trump's decision to take out Iranian Gen. Qassem Soleimani.

Warren has ramped up her criticism of Trump over the strike against Soleimani in recent days.

Let our news meet your inbox. The news and stories that matters, delivered weekday mornings. This site is protected by recaptcha

On Thursday night, Warren called Soleimani a "murderer" in her initial reaction.

"Soleimani was a murderer, responsible for the deaths of thousands, including hundreds of Americans. But this reckless move escalates the situation with Iran and increases the likelihood of more deaths and new Middle East conflict. Our priority must be to avoid another costly war," she tweeted.

On Friday, she criticized the president's actions more forcefully, tweeting that he has "repeatedly escalated tensions" with Iran.

"Now he's assassinated a senior foreign military official," she continued. "He's been marching toward war with Iran since his first days in office — but the American people won't stand for it."

U.S. forces killed Soleimani in an airstrike near Baghdad's airport last week as tensions continue to rise in the region.

The Trump administration has said the attack was necessary to stave off an imminent threat to U.S. lives. U.S. officials deem Soleimani responsible for a recent rocket attack that killed a U.S. contractor, as well as for the previous attacks on Americans.

"There were, in fact, plots that he was working on that were aimed directly at significant harm to American interests throughout the region," Secretary of State Mike Pompeo said Sunday on "Meet the Press."

"We would have been culpably negligent had we not taken this action. The American people would've said we were not doing the right thing to protect American lives."

Download the NBC News app for breaking news and politics

Warren is not the only Democrat raising concerns. House Speaker Nancy Pelosi of California warned that the strike was carried out without congressional approval and that it "risks provoking further dangerous escalation of violence."

And Sen. Mark Warner of Virginia, the ranking member of the Intelligence Committee, said it was clear that Soleimani was a "bad guy," but he expressed frustration that the administration did not consult with Congress or its allies abroad before the strike.

"I accept the notion that there was a real threat. The question of how imminent is something I need more information on," Warner said.