Democratic presidential candidate 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 responded to remarks from President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE regarding offers of foreign intelligence, saying that in that case, the president should "call the FBI."

The South Bend, Ind. mayor told CBS's "Face the Nation" that it is not acceptable to receive information from a foreign government about a political opponent.

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"Just call the FBI. It's not hard. It's not complicated," he said. "If you think there's a foreign effort to tamper with an American election and you're an American who cares about America, you call the FBI."

Buttigieg also said that this issue "isn't hypothetical," referring to Russian interference attempts in in past elections.

"We were attacked by a hostile foreign power that decided that they could damage America, destabilize America, by intervening in the election to help him win. And they did and he did, and now America's destabilized," he said, apparently talking about Trump. "So this is not some academic exercise. This is something that has happened and will probably happen again."

The presidential hopeful also questioned how a president who cares about the U.S. could allow a "potentially hostile foreign power" to interfere in its elections.

"You have to draw a very clear line," he said. "If you care about this country, if you believe in putting this country first, how could you ever talk about allowing a foreign- potentially hostile foreign power to interfere in the most sacred thing that we have in our civic tradition in America, which is our elections?"

When asked about @realDonaldTrump’s comments that if a foreign government offered him information on his opponent he'd listen. @PeteButtigieg says that isn’t acceptable, “Just call the FBI. It's not hard. It's not complicated.” Story here: https://t.co/A8YJYuPkhB pic.twitter.com/yeNDaEphYs — Face The Nation (@FaceTheNation) June 15, 2019

Buttigieg's remarks come after President Trump said Wednesday that he would consider accepting information political opponents from foreign entities.

“I think you might want to listen. There’s nothing wrong with listening,” Trump told ABC News. “It’s not an interference. They have information. I think I’d take it. If I thought there was something wrong, I’d go maybe to the FBI.”

In the interview, ABC News host George Stephanopoulos George Robert StephanopoulosColbert implores Pelosi to update 'weaponry' in SCOTUS fight: 'Trump has a literal heat ray' Murkowski: Supreme Court nominee should not be taken up before election Cruz says Senate Republicans likely have votes to confirm Trump Supreme Court nominee MORE noted that Trump's FBI director, Christopher Wray, has said campaigns should report such contact from foreign entities to the bureau.

"The FBI director is wrong," Trump responded.

The president's remarks received criticism from several lawmakers.