WASHINGTON — Hillary Clinton on Tuesday accelerated her call for technology companies to cooperate with the government and develop a “unified national strategy in cyberspace” to stop the Islamic State from using the Internet to recruit members in the United States and around the world.

Speaking at the University of Minnesota a few hours before Republican presidential candidates were to debate in Las Vegas, Mrs. Clinton made her third speech in three weeks about how to counter violent jihadism. Drawing on her time as secretary of state, she proposed new procedures for issuing visas to any foreigners who have traveled in specific areas and to argue for boosting intelligence resources devoted to tracking potential terrorists.

Mrs. Clinton, the leading contender for the Democratic presidential nomination, according to polls, also offered a few jabs at Republican candidates, who have struggled to find their footing on foreign policy. Although she did not mention him by name, she ridiculed Senator Ted Cruz’s threat to “carpet bomb” areas of Syria where Islamic State fighters are occupying territory — a step many believe could constitute a war crime because many civilians live in the same areas.

“Shallow slogans don’t add up to a strategy,” Mrs. Clinton said. “Bluster and bigotry are not credentials for becoming commander in chief.”