Donald Trump at a rally in Florence, South Carolina, on Feb. 5, 2016.

The U.S. Department of Defense must pump up its cyber capabilities, including its offense, as part of a huge planned expansion of the military, Republican presidential candidate Donald Trump said Wednesday.

Trump, repeatedly criticized in the IT community for a lack of a tech policy agenda, called for new investments in cybersecurity during a speech focused on military programs.

The businessman didn't put a dollar figure on the new cybersecurity investments but mentioned them as part of a proposed multibillion-dollar expansion of the U.S. military.

Trump will ask military leaders and federal agencies "to conduct a thorough review of United States cyber defenses and identify all vulnerabilities -- in our power grid, our communications systems, and all vital infrastructure," he said during a speech in Philadelphia.

"We will invest heavily in offensive cyber capabilities to disrupt our enemies, including terrorists who rely heavily on internet communications."

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