Washington, D.C. – The investigation into former President Donald Trump’s firing of cybersecurity official Chris Krebs is reportedly growing in unexpected ways.

According to reports from The Hill and MSNBC, the special counsel appointed to investigate potential wrongdoing by the Trump administration has subpoenaed multiple White House aides, seeking information about the events leading up to Krebs’ dismissal.

Krebs, who was the director of the Cybersecurity and Infrastructure Security Agency, was fired by Trump in November 2020 after he publicly disputed the then-president’s claims of widespread voter fraud in the 2020 election.

The firing was widely seen as part of Trump’s ongoing efforts to undermine confidence in the integrity of the election, and Krebs later filed a lawsuit alleging that his dismissal was unlawful.

The subpoenas reportedly seek information about communications between White House officials and others involved in the decision to fire Krebs, as well as any efforts to pressure him to change his conclusions about the security of the election.

The investigation is being led by special counsel John Durham, who was appointed by former Attorney General William Barr to investigate the origins of the Russia investigation. It is unclear how Durham’s investigation into Krebs’ firing fits into his larger mandate.

Durham’s probe reportedly began in the final months of the Trump administration and has continued under the Biden administration. It has been widely criticized by Democrats as a politically motivated attempt to discredit the FBI and other law enforcement agencies that investigated Russian interference in the 2016 election.

The White House has not yet commented on the subpoenas or the ongoing investigation. Krebs, however, tweeted in response to the reports, saying, “Firing me was because I stood up for the truth. If that is being investigated, then so be it.”