"You can't just sit on it and you can't not show. Somebody will show up with handcuffs," Andrew Napolitano said.
Trump Jr. "has testified 20+ hours already & was cleared of any crimes by Mueller," a spokesman for the first son tweeted.
"I don't see Senate Intel doing this, but House Intel and/or Judiciary should subpoena Ivanka Trump and Jared Kushner too," former prosecutor Elizabeth de la Vega tweeted.
Two congressional sources claimed that Trump Jr. would not comply with the Senate Intelligence Committee subpoena and would likely cite his First Amendment constitutional right to avoid self-incrimination.
The subpoena was the first to target a member of the president's family.
"What is it that they so desperately want to cover up?" Glenn Kirschner asked. "The concentric circles are tightening and tightening."
"Security is never a finished job," said Facebook COO Sheryl Sandberg. "Our adversaries are determined, creative and well-funded."
Since the election, President Trump has denied there was Russian influence in the election, despite the intelligence community's findings.
Democrats on the Senate intelligence committee have reportedly wanted to interview Ivanka Trump for some time.
"We see no reason to dispute the conclusions," Senate Intelligence Committee Chairman Richard Burr stated.
The former Trump campaign adviser has been a target for the Senate Intelligence Committee.
Department of Homeland Security (DHS) secretary said 20 state officials out of 150 have received security clearance, no explanation of plan to fight misinformation.
The president's intelligence chiefs say Russia will interfere in the 2018 midterms, and there is little to stop them.
Senate investigators interviewed the president's son in a guarded, secure space.
Republican lawmakers have called for a special counsel to investigate Lynch.
But the Senate intelligence committee's probe is moving forward.
Alarmed by Trump inaction, the leaders of the Senate Intelligence Committee want firmer measures on Russian subversion.
Social media company's confidence in its findings about ads run during 2016 election campaign has increased since September.
His latest explanation: He was worried about Hillary Clinton.
The Senate and House intelligence committees and the Senate Judiciary Committee are overseeing investigations into Russian meddling in the presidential election.
On Tuesday, the attorney general helped blunt the investigation into Russian interference in the 2016 election through denials, nonanswers and lapses in memory.
The attorney general spoke for the first time publicly about the firing of FBI Director James Comey.
Social media users have spotted a sly joke in a Smirnoff ad.
Senator Dianne Feinstein recommends the 'Judiciary Committee investigate all issues that raise a question of obstruction of justice.'