However, in a recent interview with VICE, Agalarov maintains that Trump Jr. did indeed contact him about it.
Manafort is scheduled to go on trial in September on separate charges brought by Mueller of conspiracy, money laundering and failing to register as an agent of a foreign government.
But lying and false claims, as well as "fake news" are nothing new from Trump and his tweets, and it's to be seen how the Manafort trial will evolve with a parade of witnesses planned.
The relationship between Sessions and the president has been strained for more than a year, since the attorney general recused himself from investigations relating to the 2016 election because of Sessions' role on the Trump campaign. "Bob Mueller is totally conflicted, and his 17 Angry Democrats that are doing his dirty work are a disgrace to the U.S.!"
"Just because @realDonaldTrump obstructs justice in full public view by calling on Sessions to interfere in Mueller investigation doesn't mean it's not obstruction of justice".
"This administration has taken a lot of people by surprise", Pastor Darrell Scott, from OH, told members of the roundtable in the White House's Cabinet room.
"It's not a secret: I think he'd like to kill the Mueller investigation any way he can, but I hope this country and particularly its representatives will not follow that", she said. "These old charges have nothing to do with Collusion - a Hoax!"
"Their attempt to claim obstruction by tweet is really a freakish and novel theory", he said.
Federal prosecutors revealed last month that he was afforded unusual privileges while in detention.
Manafort worked for pro-Russian politicians in Ukraine.
Zimbabwe opposition leader says winning election 'resoundingly'
Africanews journalist Nyasha Mutizwa is from Zimbabwe and she's has been following up on the polls with our men on the ground. The commission said it would delay releasing any results of the presidential race until all the votes are collated.
Agalarov is said to have helped set up the June 9, 2016 meeting attended by then-candidate Donald Trump's son, son-in-law Jared Kushner, and campaign manager Paul Manafort. He oversaw the early days of the general election effort.
Even as his lawyers scrambled to convey what Trump intended, the president continued to tweet about the Russian Federation probe. She speculated that Putin might have raised those concerns with Trump at their summit last month.
Democratic lawmakers criticized Trump for seeking an end to the probe and urged that Congress protect the investigation.
Agalarov is on record saying in a Vice interview that he spoke with Trump Jr. before the meeting. From the White House briefing room podium on Wednesday, Sanders declined to denounce the harassment of a CNN reporter during a Trump rally in Florida on Tuesday.
US intelligence officials are anxious Russian Federation and perhaps other foreign actors look to interfere in November's elections, just as Moscow did in 2016, members of President Donald Trump's national security team said Thursday.
"I mean, I guess if we were playing poker, we'd say 'put up or shut up, ' " he continued.
"It's not an order, it's the president's opinion", Sanders said.
Ironically, one of the areas the Mueller investigation is looking at is whether the president has used Twitter to try to pressurise or intimidate his attorney general. I think that would've been a much clearer, much bolder statement to be able to confront him.
Trump's tweets came at a particularly sensitive time in the investigation, as a federal jury in Virginia is hearing evidence in Manafort's trial on tax evasion and fraud charges. Democratic Sen. Richard Blumenthal of CT went much further, declaring. "He's instructing his attorney general, via Twitter perhaps, to stop the Russian Federation investigation", said Painter, a Democratic candidate for Senate in Minnesota.
Colleen Long and Lisa Mascaro of the Associated Press contributed.