House Minority Leader Nancy Pelosi (D-Calif.) said President Trump doesn't understand just how much weight his words carry amid growing concern over heightened tension between the U.S. and several countries, including North Korea.

"I'm not sure the President has understood that a president's words weigh a ton and you can't say things casually," Pelosi told David Axelrod on the podcast "The Axe Files."

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She said his hard-hitting rhetoric and fiery remarks go much further than "raising eyebrows," as they make U.S. allies nervous about the possibility of a military conflict.

"There could be a serious military initiation of serious military action, which would be most unfortunate," she added.

Pelosi's comments come after Trump threatened last month to "totally destroy North Korea" and take military action if it continues to threaten the U.S. or its allies. Trump also made comments in August that seemed to suggest he was keeping military action against Venezuela on the table.

Pelosi is not the only lawmaker who has raised concerns over Trump's rhetoric.