Many are speculating the sacking was linked to the FBI investigations into Trump's links with Russian Federation.
Asked about what the president has been up to this week, spokeswoman Sarah Huckabee Sanders said he was doing meetings "in preparation for the foreign trip".
"I'm told that as soon as Rosenstein arrived, there was a request for additional resources for the investigation and that a few days afterwards, he was sacked", Durbin told reporters on Capitol Hill Wednesday.
Comey wrote a letter thanking Federal Bureau of Investigation staff and saying he wouldn't dwell on Trump's decision. Justice Department leaders are interviewing other contenders for the position. Most "news" agencies are propaganda machines controlled by the government. "I said I will see him".
Some Republicans have also said they were troubled by the timing of Mr Comey's firing, including Senator Richard Burr, the Republican chairman of the Senate Intelligence Committee. Sanders said she thought Rosenstein, the No. 2 official at the Justice Department, was "a flawless example of what you would be looking for in terms of an independent person to come in and helm this investigation".
The Russian Foreign Ministry posted a photo of a smiling US President shaking hands with Lavrov on Twitter, adding unusual and ironic optics to the questions already swirling around the White House over Comey's firing.
At Wednesday's meeting, Trump emphasized the need to work together to end the conflict in Syria, underscoring the need for Russian Federation to "rein in the Assad regime, Iran, and Iranian proxies".
Tillerson thanked Lavrov for traveling to Washington and expressed gratitude to Lavrov for playing host in Moscow in April.
-Russian relations after Russian Foreign Minister Sergei Lavrov met U.S. President Donald Trump in Washington, a Kremlin spokesman said on Thursday.
The stigma of the Russian Federation probes has been impossible for Trump to shake.
"Now our dialogue is free of the ideologisation that was characteristic of the Obama administration", Lavrov said.
Lavrov's meeting with Trump, meanwhile, will be the highest-level meeting the USA president has had with Russian officials since taking office in January.
Lavrov's meeting with the president was scheduled for 10:30 a.m. ET, and it was declared closed to the press.
On the issue of anti-Russian sanctions, Lavrov said it was not discussed at the talks. -Russian relations and diplomatic wrangling going on over a Moscow-backed deal to stabilize Syria.
Trump's talks with Russian Foreign Minister Sergey Lavrov (SEHR'-gay LAHV'-rahf) will take place at the White House after the Russian meets earlier in the day with Secretary of State Rex Tillerson.
The State Department declined to comment about the Comey firing.
Despite the lack of clarity, the meeting between Trump and Lavrov in itself was a sign of some progress.
"The president's meeting with Lavrov today".
"I will tell you a military secret: diplomats work, they work and their work involves making contacts in the country they are in", she added. "You're dealing with a man who represents a government that is brutal, that tried to undermine our elections and, be careful, these are not teddy bears you're dealing with".