The charges do not concern Manafort's work for Trump during the campaign.
"This is a awful situation and Attorney General Jeff Sessions should stop this Rigged Witch Hunt right now, before it continues to stain our country any further", Trump said.
The evolving argument from Trump and his lawyers comes just a week after Michael Cohen, Trump's former personal attorney, asserted that Trump knew in advance about a meeting at Trump Tower in June 2016 between his son Donald Trump Jr. and a Russian lawyer. And why isn't Mueller looking at all of the criminal activity & real Russian Collusion on the Democrats side-Podesta, Dossier?
The President's lawyers had previously offered the special counsel written answers to obstruction questions and limiting the interview to matters before his presidential inauguration, which are largely confined to collusion.
Rosenstein, in turn, appointed Mueller and is the person with the authority to fire him.
In a series of tweets targeting Mr Mueller's credibility, Mr Trump alleged he had "a very nasty and contentious business relationship" with Mr Mueller. Therefore, the Witch Hunt is an illegal Scam! According to the Washington Post daily, Mueller is using documents compiled by Comey in his investigation.
As CNN has previously noted, records from the Federal Election Commission have shown some members of the special counsel team donated to Democrats.
Emmerson Mnangagwa, Nelson Chamisa both say on course for poll win
The victor of this landmark election will be tasked with putting Zimbabwe back on track after 37 years of Mr Mugabe's rule. As voters race to cast their ballots, some prophets are predicting the outcome of the first election without Mugabe.
The man heading Trump's re-election campaign, Brad Parscale, has in recent months called on Trump to fire Sessions and end the Mueller probe.
In a memo released in February, The House Republicans had confirmed that the probe was launched following the information from Papadopoulos, who has been found guilty of furnishing wrong information to the FBI and is assisting with the Mueller investigation.
For months, Trump has insisted that there was "no collusion", but his Tuesday morning tweet hints at a potential expansion of his defense amid the ongoing special counsel investigation.
Multiple former Trump campaign officials have been indicted in the investigation.
Former FBI Director James Comey has said collusion 'is not actually a thing that exists under the federal laws of the United States.' Comey, who was sacked by Trump in an act being probed for possible obstruction of justice, argued an April CNN town hall the issue is whether Trump or his associates conspired with a foreign power to break the law.
Also on Sunday, Trump tweeted a threat to shut down the government if Congress did not provide money for his proposed border wall with Mexico and railed against the news media.