Earlier, the United States president called the Mueller investigation the "greatest witch hunt in American history".
Leading Democratic lawmakers believe Mueller is investigating Trump in part over his firing of FBI Director James Comey, which Trump said was motivated by the Russian Federation investigation.
This is a real exchange that happened between President Donald Trump and Fox News' chief White House correspondent John Roberts in a press conference with the Norwegian prime minister on Wednesday afternoon.
Finger-pointing and acrimony surrounding probes of Russian meddling in the 2016 USA election intensified Thursday, with the Trump White House and Democratic lawmakers trading accusations of undermining and manipulating investigations that require bipartisan buy-in to succeed.
President Donald Trump's announcement of U.S-made F-52s fighter aircraft delivered to Norway may have rattled its neighbour Russian Federation, the source of rising tension among North Atlantic Treaty Organisation allies.
That's because of a letter then-FBI Director James Comey sent to lawmakers on October 28, 2016 - 12 days before voters went to the polls to decide whether Trump or Hillary Clinton would become the 45th president of the United States.
"Certainly I'll see what happens", Trump said.
Republicans who spent the early months of 2017 working with Democrats on investigations into Russian interference in US elections have pivoted as the new year begins and midterm elections loom, leaving the conclusions of those congressional probes in doubt. William Burck, a former White House special counsel during the George W. Bush administration and a former federal prosecutor, is helping Bannon prepare for questions from the House panel about the presidential campaign, CNN reports.
The lawyers' decision will be influenced by what topics Mueller wants to question Trump about and whether the information can be obtained elsewhere, sources familiar with their thinking say.
Trump emphasized the circumstances around Clinton's interview with the FBI, which took place at the end of a lengthy FBI investigation, and a day before Comey recommended that no criminal charges be filed, despite finding Clinton had been "grossly negligent" in handling of classified information.More news: Reluctant Trump grants sanctions relief to Iran one last time
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She released the transcript of Glenn Simpson's interview over the objections of the committee's Republican chairman, Senator Chuck Grassley. If the National Security Agency is monitoring a Russian spy within Russia and he gets a call from an American, Section 702 permits USA intelligence officers to continue listening without asking a judge for a warrant. Dianne Feinstein of being "underhanded and a disgrace" for disclosing details of a dossier of allegations about his ties to Russian Federation during the presidential campaign.
Whether Trump will have to answer those questions in front of a grand jury, during a video deposition at the White House, or in a written format, and whether a subpoena will be required to compel cooperation, will be negotiated between Mueller's team and Trump's lawyers.
The committee is expected to hear at least one witness related to the Russian Federation probe as soon as next week: Former White House chief strategist Steve Bannon.
A spokesman for Nunes declined to comment.
"On Fire and Fury, by Michael Wolff: "[Wolff] said he interviewed me for three hours in the White House.
Feinstein faces a primary from California state Senate leader Kevin de Leon.
"The innuendo and misinformation circulating about the transcript are part of a deeply troubling effort to undermine the investigation into potential collusion and obstruction of justice", she said.
Virginia Sen. Mark Warner, the top Democrat on the Senate intelligence committee, also criticised Trump's tweet, saying it "smacks of interference in investigations and I think that's inappropriate".