Akhmetshin, who reportedly has ties to Russian intelligence and told the Associated Press he served in a military intelligence unit, became a naturalized American citizen in 2009.
"I’d certainly like to ask him questions under penalty of perjury," said Speier, who said she didn't know whether Akhmetshin had been contacted by congressional investigators.
"Failing to disclose or willfully misrepresenting information to obtain an immigration benefit can lead to a finding of inadmissibility, or denaturalization if the individual has already obtained citizenship," Grassley wrote in his July letter to Secretary of State Rex Tillerson and then-Secretary of Homeland Security John Kelly.
Speier recently traveled to Bulgaria, the Czech Republic and Hungary with the House Intelligence Committee, and said the trip provided "background" for the panel's ongoing Russia investigation.
"It shapes my understanding of our intelligence responsibilities vis-a-vis Russia and what Putin is doing in these countries to ingratiate himself, and what he does to gain both visibility and allegiance," she said.