National Guard troops in Washington, D.C., will begin carrying pistols and rifles Sunday night as part of President Donald Trump’s crime crackdown, officials confirmed. The Guard said weapons would only be used as a last resort, according to Reuters.

Trump signaled he may expand deployments to Chicago and Baltimore, criticizing Democratic leaders despite data showing crime has fallen in both cities.

House Minority Leader Hakeem Jeffries and Illinois Governor JB Pritzker said Trump lacks authority to send troops into Chicago, calling the move an attempt to “manufacture a crisis.”

While Trump holds direct authority over the D.C. Guard, any effort to deploy troops to Democratic-led cities would likely face legal challenges, Reuters reported.