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WATCH: Sean Spicer addresses immigration, voter fraud in daily news briefing

The White House says certain government agencies are taking action to address the “inappropriate” use of social media.

White House press secretary Sean Spicer addressed an incident at the Defense Department in which tweets were sent from the department’s official account that suggested underhanded criticism of President Donald Trump’s policies.

Spicer said an “unauthorized user” had an old password and logged into the Twitter account from the San Francisco office, then tweeted “inappropriate things that were in violation of their policy.”

He also cited an incident last year at the Environmental Protection Agency, saying both agencies are going to take action.

E-mails sent to EPA staff and reviewed by The Associated Press detailed specific prohibitions banning press releases, blog updates or posts to the agency’s social media accounts as part of a push by the Trump administration to institute a media blackout.

Also, President Donald Trump is signing two executive orders in keeping with campaign promises to boost border security and crack down on immigrants living in the U.S. illegally.

The president signed the two orders Wednesday during a ceremony at the Department of Homeland Security after honoring the department’s newly confirmed secretary, retired Gen. John Kelly.

The executive orders jumpstart construction of a U.S.-Mexico border wall, one of his signature campaign promises, and strip funding for so-called sanctuary cities, which don’t arrest or detain immigrants living in the U.S. illegally.

Spicer also said that President Donald Trump plans to open an investigation into voter fraud “to understand where the problem exists, how deep it goes.”

Trump tweets on Wednesday calling for the investigation revisited unsubstantiated claims he’s made repeatedly about a rigged voting system.

Spicer did not provide many details as to what the probe would look like, calling it at one point “a task force.”

He suggested that the probe would focus on dead people who remained on the voter rolls and people registered in two or more states. In particular, he singled out “bigger states” where the Trump campaign “didn’t compete” in the election.

There is no evidence of widespread voter fraud occurring in November’s election.

Watch his remarks in the player above.

The Associated Press wrote this report.