U.S. President Joe Biden has set a target of delivering 200 million COVID-19 vaccinations during his first 100 days in office.

He was laying out new goals for U.S. vaccinations at his first formal White House news conference.

"We will have carried out 200 million injections by my 100th day in office," said Biden.

The number is double the goal he set in December and reached earlier this month before his 60th day in office.

Topics during the news conference also included immigration, infrastructure, gun control and foreign relations.

Biden says he's committed to making progress on overhauling the U.S. immigration system, bolstering gun laws and strengthening voting rights.

Meanwhile, he said the U.S. will "respond accordingly" if DPRK escalates its missile testing.

"We are consulting with our partners and allies," Biden said. "And there will be responses if they choose to escalate.

"We will respond accordingly."

Biden said he was "prepared for some form of diplomacy" with DPRK but it "has to be conditioned upon the end result of denuclearization."