Sen. Richard Blumenthal (D-Conn.) on Thursday said Donald Trump Jr., the president's eldest son, should go to jail if he doesn't comply with a subpoena to appear before the Senate Intelligence Committee to clarify his earlier testimony about Russian interference in the 2016 presidential election.

"The subpoena should be enforced. If he refuses to obey it, he should be locked up," Blumenthal said.

"There are no privileges for Donald Trump Jr. The son of the president doesn't have any of those privileges," he said, referring to executive privilege.

Blumenthal said Trump Jr.'s testimony to the Senate Judiciary Committee in September 2017 appears to conflict with the findings of the Mueller report. He added that the Senate Intelligence Committee, which recently subpoenaed Trump Jr., is entitled to scrutinize his earlier answers.

"There are a number of responses he gave that are challengeable based on the truth," said Blumenthal, a member of the Judiciary Committee. "There are a number of areas that need to be scrutinized by the Intelligence Committee. His responses in the Judiciary Committee are certainly one of those areas."

When Trump Jr. testified before Judiciary Committee members and staff he was informed that it would be a crime to make "materially false, fictitious or fraudulent statements."

He was also informed that witnesses who make knowingly false statements could be subject to up to five years in prison.

"I was in the room and my clear impression was that his answers were deliberately misleading and false. He said he was only peripherally aware of the negotiations in Moscow for Trump Tower there when apparently he was briefed extensively," Blumenthal said.

A transcript of Trump Jr.'s testimony shows that he told investigators that he was only "peripherally aware" of the talks to build the Trump Moscow project during the 2016 campaign.

The report from special counsel Robert Mueller that was made public last month said Trump Jr. "served as the primary negotiator on behalf of the Trump Organization" in 2013 and 2014, when the Trump Organization was discussing a joint venture with the Crocus Group to build a development in Moscow.

The Mueller report also says that Michael Cohen, President Trump's former personal lawyer, discussed the Moscow project with Trump Jr. during the fall of 2015.

Blumenthal said Thursday that Trump Jr. also appears to have given misleading testimony about a June 2016 meeting in Trump Tower with a Russian attorney with ties to the Russian government.

Trump Jr. told the Judiciary Committee that he "never spoke to my father about it."

The Mueller report says the president edited his son's statement about the meeting through now-former White House communications director Hope Hicks.

According to the report, "The President told Hicks to say only that Trump Jr. took a brief meeting and it was about Russian adoption."

Hicks texted Trump Jr. a revised statement about the June 2016 meeting after speaking to the president, the Mueller report stated.