An ethics lawyer under former President George W. Bush blasted Donald Trump Jr. for meeting with a Russian lawyer who claimed to have compromising information on then-Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE during the campaign, saying it “borders on treason.”

“This was an effort to get opposition research on an opponent in an American political campaign from the Russians, who were known to be engaged in spying inside the United States,” Richard Painter said Sunday on MSNBC.

“We do not get our opposition research from spies, we do not collaborate with Russian spies, unless we want to be accused of treason.”

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Painter said the Bush administration would not have allowed the meeting, which was attended by Trump Jr., then-Trump campaign chairman Paul Manafort and President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's son-in-law Jared Kushner, now a White House senior adviser, to happen.

“If this story is true, we’d have one of them if not both of them in custody by now, and we’d be asking them a lot of questions,” he said. “This is unacceptable. This borders on treason, if it is not itself treason.”

Painter’s comments follow a Sunday report from The New York Times that Trump Jr.’s meeting with the Russian lawyer, who has ties to the Kremlin, came after the lawyer promised damaging information about Clinton.

He attended the meeting with the expectation that he would receive compromising information about Clinton, three advisers to the White House briefed on the meeting and two other sources with knowledge of the matter told the Times.

Trump Jr. said in a statement to the paper on Sunday that he had met with Natalia Veselnitskaya at the request of an acquaintance and denied that he received any information on Clinton.

“After pleasantries were exchanged, the woman stated that she had information that individuals connected to Russia were funding the Democratic National Committee and supporting Ms. Clinton,” he said. “Her statements were vague, ambiguous and made no sense. No details or supporting information was provided or even offered. It quickly became clear that she had no meaningful information.”

“It became clear to me that this was the true agenda all along and that the claims of potentially helpful information were a pretext for the meeting,” Trump Jr. said.