Trump Jr has already testified at length to the committee, which is run by Republicans, and was "totally exonerated by Mueller", Trump said.
"Some of the criticisms out there are not the first time the chairman or I have received criticisms over this investigation", Warner told reporters Thursday.
Trump Jr.is the first known member of the president's immediate family to face a subpoena over Russian Federation testimony.
Lying to a congressional committee could be a crime, and Senate intelligence members are likely interested in finding out whether Trump Jr. deliberately misled them in 2017. "I was very surprised to see my son-my son is a good person, he works hard".
"Frankly, for my son after being exonerated and now, getting subpoenaed, and to go again to speak again after close to 20 hours telling everybody that would listen" about the Trump Tower meeting, Trump said, he was "very surprised" by the subpoena.
"I think it's over".
Asked whether Burr cleared the subpoena with McConnell in advance, a spokesman for the majority leader said McConnell has not directed Burr or the committee on anything during the probe. "I think that the case is closed".
Intelligence Committee Chairman Richard Burr, R-N.C., and Vice Chairman Mark Warner, D-Va., made a decision to subpoena Donald Trump Jr., prompting criticism from Republicans.
McConnell said of Burr's investigation only that the "upcoming report from the Select Committee on Intelligence" would help the Senate determine what it needs to do for election security.
"Don and Senate Intel agreed from the very beginning that he would appear once to testify before the committee and would remain for as long as it took to answer all of their questions".
41, has testified voluntarily in private once to the committee, and was peppered with questions about a June 9, 2016 meeting in Trump Tower in NY that he and other senior Trump campaign officials had with a Russian lawyer offering dirt on Democratic presidential candidate Hillary Clinton.
Senate Judiciary Committee Chairman Lindsey Graham, R-S.C., stressed that he would not second-guess Burr but said in his view, "Mueller's the final word for me".
Sen. Rand Paul (R-KY), who is an ally of Trump's, was the first GOP senator to publicly criticize Burr. "Mitch McConnell should kill this subpoena..." And the Mueller report made no recommendations against him.
Trump claimed Burr, a Republican from North Carolina, had declared "no collusion" following the release of special counsel Robert Mueller's report last month.
"Don continues to cooperate by producing documents and is willing to answer written questions, but no lawyer would ever agree to have their client participate in what is an obvious PR stunt from a so-called "Republican" Senator to cowardly to stand up to his boss Mark Warner and the rest of the resistance Democrats on the committee", the source told Guardian reporter Ben Jacobs.
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