Trump and some of his aides reportedly believe the probe is coming to a close.
Senator Richard Blumenthal said a subpoena would reassure the American people that Trump Jr. "had been forthcoming."
The president's counselor said the report was evidence of an attempt to get rid of Trump.
The top Democrat on the committee said a number of factors pointed towards a case for obstruction.
Mark Warner said new revelations emerged on a weekly basis.
Congressman Mike Conaway said it would be "a surprise" if the House Intelligence Committee concluded its investigation this year.
The political commentator said he was "done" and so was Trump.
The former White House aide said the Kremlin had been "mucking around" in elections for decades.
Sixty percent of American voters feel the investigation is being conducted fairly, a poll shows.
Republican lawmaker says Mueller "must step down immediately” because of ties to the Obama administration.
Among those who felt President Donald Trump likely committed a crime, 19 percent believed there was solid evidence
The president's base has lined up behind him amid the Russia probe.
Eric Trump's fundraising email has the subject line "Still standing."
The Clinton campaign and DNC helped finance the Steele dossier, but important elements of the document have panned out.
Comey may simply have gone to Iowa to attend a family birthday dinner.
The former presidential nominee said that if she had been elected she'd have called for an independent commission to "get to the bottom of it."
The two documents concern emails sent between a Trump associate and Russian officials.