Sen. Lindsay Graham (R-S.C.) said on Sunday that the definition of “abuse of power” used in the House’s impeachment articles against 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 would have ramifications for future presidents as well.

“Abuse of power is so poorly defined here I don’t know presidents in the future can confirm their conduct,” Graham, the chair of the Senate Judiciary Committee, said on “Fox News Sunday.”

Graham also assailed the House’s second article of impeachment, obstruction of Congress, saying Trump merely “tried to exercise executive privilege” after the House called for testimony from Secretary of State Mike Pompeo Michael (Mike) Richard PompeoHouse panel halts contempt proceedings against Pompeo after documents turned over Outgoing ambassador to China slams Beijing over coronavirus: 'Could have been contained in Wuhan' Hillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers MORE, acting Chief of Staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE and former National Security Adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE.

“It’s the first impeachment in modern history without outside counsel… they had to do it in such a hurry he could not exercise executive privilege,” he added.

“Any president has the right to defend the office,” Graham added, saying that even as House Democrats have argued the president is not above the law, “they tried to put Trump below the law.”

House Democrats on Saturday unveiled the outline of their legal case heading into the Senate impeachment trial, which begins on Tuesday. They say the only lingering question in the case is whether the Senate will be a fair arbiter of justice.

Trump’s legal team, however, declared the impeachment articles “constitutionally invalid” and accused House Democrats of a “brazen and unlawful attempt” to overturn the results of the 2016 presidential election.