President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE weighed in backlash to the Senate Intelligence Committee subpoenaing Donald Trump Jr. Don John Trump'Tiger King' star Joe Exotic requests pardon from Trump: 'Be my hero please' Zaid Jilani discusses Trump's move to cancel racial sensitivity training at federal agencies Trump International Hotel in Vancouver closes permanently MORE Sunday, calling it "really sad!"

Trump shared a story from Breitbart about backlash within North Carolina to Sen. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.), the chairman of the intelligence panel.

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Burr called for Donald Trump Jr. to testify in connection with the panel's investigation into Russian election interference.

Trump Jr. already testified behind closed doors before the House and Senate Intelligence panels in December 2017 as part of their investigations into Moscow's involvement in the 2016 election. Neither committee has released a transcript of his closed-door hearing.

President Trump said last week that he was “very surprised” his eldest son was being subpoenaed by the GOP-controlled committee.

“Frankly for my son, after being exonerated, to now get a subpoena to go again and speak again after close to 20 hours of telling everybody that would listen about a nothing meeting, yeah I’m surprised,” Trump told reporters at the White House on Thursday.

Many other Republicans have criticized the subpoena, including Sen. Rand Paul Randal (Rand) Howard PaulRand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts Health officials tell public to trust in science MORE (R-Ky.) and House Minority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy threatens motion to oust Pelosi if she moves forward with impeachment Kate Schroder in Ohio among Democratic challengers squelching GOP hopes for the House McCarthy's Democratic challenger to launch first TV ad highlighting Air Force service as single mother MORE (R-Calif.).