Two weeks after the National Rifle Association endorsed Republican Donald Trump for president, two key gun control groups backed by former New York Mayor Michael Bloomberg on Friday endorsed Democrat Hillary Clinton, urging the issue be the No. 1 topic of the election.

"2016 will be the year of gun safety," said the two groups, Everytown For Gun Safety and Moms Demand Action For Gun Sense In America.

Clinton has promised gun control on her "very first day" as president, and has in the past backed new taxes on weapons and a ban on some firearms.

The endorsements came a day after the groups, teaming with anti-gun politicians and Hollywood stars, held a national day of gun violence awareness during which supporters are urged to wear orange. Clinton wore orange during her heavily covered speech attacking Trump's foreign policy on Thursday.

"Our litmus test is simple: does a candidate side with the public or with the gun lobby? Hillary Clinton passes that test with flying colors – pushing back against the NRA's extreme 'guns for everyone, everywhere' agenda, and ushering in a new political calculus that saving lives from gun violence is a winning issue," said John Feinblatt, president of Everytown.

"Moms and survivors will elect Secretary Clinton as the first gun sense president," added Shannon Watts, founder of Moms Demand Action.

By suggesting that Hillary Clinton would be the "first" anti-gun president, her comment raised new concerns in the pro-gun community that Clinton would move to enact an Australian-style gun grab since Clinton's husband, former President Clinton, enacted the assault weapons ban, still considered the most aggressive gun control ever.

During the recent NRA convention in Louisville, Ky., Trump promised to protect gun owners and the Second Amendment.

Paul Bedard, the Washington Examiner's "Washington Secrets" columnist, can be contacted at