Grassley and Feinstein wrote that the committee "may be willing to excuse [Manafort] from Wednesday's hearing if he would be willing to agree to production of documents and a transcribed interview".
Manafort was due to speak about the 2016 meeting in Trump Tower between Russian lawyer Natalia Veselnitskaya and Donald Trump Jr after she promised to deliver compromising information on the Clinton campaign.
_Contributed by AP writer Chad Day.
White House adviser Jared Kushner, right, and his attorney Abbe Lowell, center, arrive on Capitol Hill in Washington, Tuesday, July 25, 2017, to be interviewed behind closed doors by the House Intelligence Committee.
Sen. Dianne Feinstein of California, the ranking Democrat on the panel, said she doesn't "know a time when the United States feels more invaded", referring to the findings that 21 states had their elections systems "pierced in this last election, we believe by Russia", and calling the Russian campaign past year an "interference with our sovereignty".
Kushner was not under oath in either interview this week.
But Mr Kushner said he had not seen those emails until recently shown them by his lawyers. He also said he was unaware of anyone in the campaign who did.
Levin investigated the practice in 2000 as the top Democrat on the Senate's Permanent Subcommittee on Investigations.
Manafort, a Washington lobbyist who headed Trump's presidential bid from June-August 2016, had been subpoenaed after negotiations for his appearance broke down. That gathering was described to Donald Trump Jr.in emails as part of a Russian government effort to aid the Trump campaign. However, Simpson has since agreed to a transcribed interview and will not testify in public.
President Donald Trump's former campaign chairman has met with Senate investigators probing Russia's meddling in the 2016 presidential election.
Manafort 'answered their questions fully, ' said his spokesman, Jason Maloni.
And it ultimately, their familiarity with each other led to the three men attending the same June 2016 meeting with Veselnitskaya.
People made from alien atoms from a galaxy far, far away
The study, which required the equivalent of several million hours of continuous computing is published by Monthly Notices of the Royal Astronomical Society .
The investigation of Trump's connections to Russian Federation and alleged interference in the 2016 election is in its early stages and the committee will continue seeking information from witnesses as necessary, the statement added.
The Senate Judiciary Committee has rescinded its subpoena compelling Paul Manafort, President Trump's former campaign manager, to testify at a public hearing later this week. Charles Grassley, R-Iowa, said.
On Tuesday Manafort met with Senate Intelligence Committee staff, providing his recollection of the Veselnitskaya meeting and agreeing to turn over contemporaneous notes of the gathering previous year, according to people familiar with the closed-door interview.
Grassley and Feinstein said Friday that they have issued a subpoena for Simpson to appear before the committee next week.
Wednesday's 1500 BST Judiciary Committee hearing is on the Foreign Agents Registration Act, which requires that a person lobbying for a foreign government in the U.S. notify their activity with the Justice Department. "Therefore, yesterday evening, a subpoena was issued to compel Mr. Manafort's participation in Wednesday's hearing", the senators said. He'll instead be questioned privately. He said he had "no improper contacts" during or after the campaign and did not rely on Russian financing in his own business dealings. USA intelligence agencies say Moscow interfered in the 2016 presidential election to benefit Trump.
"I did not collude with Russians, nor do I know of anyone in the campaign who did so", he said.
Trump also maintains there was no collusion with Russian Federation.
The president has called the investigations a politically motivated witch hunt fuelled by Democrats.
Trump says: "Next up, 11 year old Barron Trump!"
That came the same day President Trump's son-in-law, Jared Kushner, testifed to Congress about Russian Federation for the second day in a row.
On Monday, he answered questions from staff on the Senate's intelligence panel.
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