Rex Tillerson on Wednesday denied that he or his former company, Exxon Mobil, lobbied against imposing sanctions on Russia.

“I have never lobbied against sanctions. ...To my knowledge, Exxon never directly lobbied against sanctions,” the prospective secretary of State said in response to a question from Sen. Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (D-N.J.).

“All the other actions taken there were taken there, they were all undertaken with a great deal of transparency and openness and engagement to the process,” he added.

Soon after, Senate Foreign Relations Committee Chairman Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) chimed in, saying he had spoken to Tillerson about the sanctions when they were being debated in Congress.

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“It’s my understanding — I think you called me during this time — that your concern with these sanctions that were in place relative to Iran were not that they were put in place, but that the Europeans had put them in a way that was different and caused an adverse situation for U.S. businesses,” Corker said.

Outside of correcting Corker to say he had called regarding Russian sanctions, not Iranian sanctions, Tillerson confirmed that the phone call had taken took place.

Lobbying disclosure forms filed by Exxon Mobil show that the company had lobbied in 2016 on a piece of legislation that levied sanctions on Russia.

Later in the hearing, Tillerson sought to clarify his answer. He said Exxon Mobil was not lobbying on whether the sanctions should be implemented, but instead asked for more time to remove its interests from Russia if the sanctions went into place.

“Exxon Mobil participated in understanding how the sanctions were going to be constructed and was asked and provided information as to how that might impact American business interests,” he said.

“The only engagement I had was after the sanctions were in place,” he added.

Immediate sanctions threatened an oil well the company was digging, so Tillerson said he spoke with the administration to “explain to them there was significant risk to people and the environment — we were fully going to comply with the sanctions but compliance went immediate evacuation of all these people that were going to put lives at risk and the environment at risk.”

That explanation didn't convince Democratic Sen. Chris Murphy Christopher (Chris) Scott MurphyGOP chairman to release interim report on Biden probe 'in about a week' This week: House returns for pre-election sprint Battle over timing complicates Democratic shutdown strategy MORE (Conn.), who called his comment a "distinction without a difference."

Menendez pulled out printed pages of lobbying disclosure reports filed by Exxon going back to at least 2009, listing legislation that would further impose sanctions on Russia. One form described a lobbying topic as "Russian Aggression Prevention Act, provisions related to energy."

"You weren't lobbying for sanctions on energy, were you?" Menendez asked.

A tense exchange about lobbying disclosure requirements followed, with Tillerson saying that the forms may have been a listing of a subject that was merely discussed.

"Let me edify you for the future," the New Jersey senator said. "You don't need a lobbying disclosure form to simply seek information and clarification on a bill. Lobbying, specifically, is to promote a view, a position or whatnot."

Exxon Mobil in a tweet denied taking a position on the sanctions.

Let's be clear: we engage with lawmakers to discuss sanction impacts, not whether or not sanctions should be imposed — ExxonMobil (@exxonmobil) January 11, 2017

Tillerson's ties to Russia have been under scrutiny throughout his confirmation hearing Wednesday. He long handled Exxon's accounts in Russia, and was bestowed a friendship award from Russian President Vladimir Putin.

Senators have pushed for Tillerson to take a tough stance on Russia, particularly in the wake of the intelligence community's assessment that the country sought to interfere in the presidential election.

President-elect Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE has pushed back on the intelligence community's assessment, and many senators are concerned that he will soften U.S. policy towards Russia and its president, Vladimir Putin.

Separately in the hearing, Tillerson said he has yet to talk with President-elect Donald Trump about the specifics of Russia policy.

This story was updated at 3:34 p.m.