An Afghan national accused of shooting two National Guard members will be charged with first-degree murder, a US official said Friday, after one of the soldiers died of her wounds as Donald Trump pledged to suspend migration from "third world countries."

The announcement marks an escalation in charges facing the assailant, identified as 29-year-old Rahmanullah Lakanwal who the US media said was part of the "Zero Units" -- a CIA-backed Afghan paramilitary force.

"There are certainly many more charges to come, but we are upgrading the initial charges of assault to murder in the first degree," Jeanine Pirro, the attorney for Washington DC, told the Fox News program Fox & Friends.

"It is a premeditated murder. There was an ambush with a gun toward people who didn't know what was coming."

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