South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE (D) said Sunday that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE’s approach to foreign policy will “cost us for years and years” on the world stage.

Buttigieg, appearing on NBC’s “Meet the Press,” assailed what he called the inconsistency of Trump’s foreign policy, particularly in the wake of his withdrawal of U.S. forces from northeastern Syria.

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"What President Trump does is wake up in the morning, have a phone call or maybe a tweet and completely change years, or even decades, of U.S. policy, surprising his own generals and country in the process," Buttigieg, a military veteran, told host Chuck Todd Charles (Chuck) David ToddMurkowski: Supreme Court nominee should not be taken up before election Republican senator says plans to confirm justice before election 'completely consistent with the precedent' Sunday shows - Trump team defends coronavirus response MORE.

"If we think that there is a commitment, a treaty or a deal that we can improve on we go to the table and we make it happen. But the credibility of the United States is something that our lives depend on. And when the president undermines it with things like the action in Syria, that is going to cost us for years and years," he added. "We've got to be a country known to keep its word."

The Democratic presidential candidate also said that Trump's decision meant that the future of the area was "being decided by everybody but the United States."

"We know that we need to promote stability, that we need to stand by our allies and that there will be legitimate Turkish security concerns that will also be part of the equation," he said. "But right now what's happening is the future over there is being decided by everybody but the United States — Russia, Iran, Turkey — and we are nowhere because American leadership has been withdrawn."

WATCH: @petebuttigieg says Middle East policy needs to be consistent. #MTP



"What President Trump does is wake up in the morning and have a phone call or maybe a tweet and completely change years or even decades of U.S. policy, surprising his own generals and country." pic.twitter.com/wnaGk7cyx4 — Meet the Press (@MeetThePress) October 20, 2019

The Syria pullout has drawn bipartisan condemnation, with critics of the move calling it a betrayal of Kurdish forces that the U.S. backed in the fight against ISIS. Vice President Pence and Turkish President Recep Tayyip Erdoğan announced a cease-fire last week, but Turkish forces have already accused the Kurds of violating it.