WASHINGTON — The US vice president was confronting perhaps his toughest meeting on gun violence policies Thursday as he prepared to meet with the country's top gun lobby, which already has fiercely opposed any suggestion of new gun controls. Vice President Joe Biden said Wednesday that President Barack Obama could act on gun violence through executive action — meaning the approval of Congress would not be required. That has unnerved some gun owners, who stand by the constitutional right to bear arms and fear their guns will be taken away. In Colorado, whose high-profile shootings include the Columbine school massacre and last year's theater attack, about 100 protesters on Wednesday demanded that lawmakers reject gun control measures. But one outspoken advocate for tighter restrictions, New York's Democratic Governor Andrew Cuomo, shouted on Wednesday, “No one hunts with an assault rifle. No one needs 10 bullets to kill a deer. End the madness now!” Cuomo's fiery policy speech called for tougher bans on assault weapons and high-capacity magazines of ammunition in a strengthening of the state's gun control laws, which already are some of the most restrictive in the country. Obama hopes to announce his administration's own steps to tackle gun violence shortly after he is sworn in for a second term on Jan. 21. The gun issue has rocketed into the top tier of his concerns for his second term after last month's school shooting in Connecticut, where a young gunman used a high-powered rifle legally purchased by his mother to shoot dead 20 children 6 and 7 years old. Tackling gun violence won't be easy in a country that is home to about 35 to 50 percent of the world's civilian-owned firearms. The NRA has blocked gun-control efforts in the past and is opposing any new ones, instead saying after the Connecticut shooting that more guns should be given to the “good guys” and an armed security officer should be in every school. Former President Bill Clinton added his voice on Wednesday, calling the availability of high-capacity gun magazines “nuts.” Biden on Thursday was also meeting with sportsmen, wildlife interest groups, retailers such as Wal-Mart and people from the entertainment industry, as some officials insist that an approach to gun violence should take into account mental illness and violent media as well. Obama supports steps including reinstating a ban on assault weapons and high-capacity ammunition magazines and closing loopholes that allow many gun buyers to avoid background checks. — AP