Yet Trump's legal team has resisted allowing him to testify, and the president himself has waffled on the matter as he railed against the special counsel's investigation into possible collusion with the Russians in 2016 and obstruction of justice.
He cited the fact he was a senior adviser to Mr Trump's presidential campaign, and appointed Deputy Attorney General Rod Rosenstein to oversee the investigation instead.
Addressing speculation about the president's intention, White House Press Secretary Sarah Sanders told a press briefing later in the day that the tweet is an "opinion", not an "order". She insisted the president's tweets are an "opinion" - but not an order.
In response to the tweet, several Democrats said it appeared that the president was trying to influence the investigation, which has indicted almost two dozen Russian officials and cyberactors for allegedly interfering in the 2016 election.
Trump has mulled easing sanctions against Moscow, held warm meetings with Russian President Vladimir Putin and refused to criticise him over the meddling in the 2016 election.
Trump said the "Russian hoax" is holding up his approach to Russia, and he lashed out at the media, which he said unfairly maligned last month's meeting.
She did not mention, however, that the Supreme Court rejected that legal analysis and sided with the Trump administration. But Trump, flustered by the probe, is reportedly pushing his team to keep negotiating under the belief he can clear himself of wrongdoing in an interview.More news: Sam Curran praises Virat Kohli’s century as England regret dropped catches
Since Mueller began to lead the probe in May 2017, he has indicted or secured guilty pleas from 32 people, including several former Trump campaign aides.
President Donald Trump on Thursday defended his meeting with Russian President Vladimir Putin last month and decried the "Russian hoax", speaking at a rally just hours removed from his top national security officials decrying Russian attempts to influence United States elections. They also pressed Mueller's investigators to demonstrate that they can not obtain the information they are seeking without interviewing the president.
As the Russian Federation probe continues, Trump and his political allies have ratcheted up pressure on Mueller and his team in recent months.
Last month, Trump came under broad, bipartisan criticism for appearing to downplay the US intelligence community's assessment that Russia was behind 2016 cyberattacks, during a press conference with Russian President Vladimir Putin.
In view of the tweet, "I think it would be helpful to have the debate on that bill", Collins said.
The emails published by Trump Jr. show publicist Rob Goldstone telling Trump that singer Emin Agalarov and his father, developer Aras Agalarov, had "helped along" the Russian government's support for Trump.
"I have a long-standing policy not to comment on tweets", said Senator Ted Cruz, .
Democratic lawmakers criticized Trump for seeking an end to the probe and urged that Congress protect the investigation.