Speaking during a joint press conference with Italian Prime Minister Giuseppe Conte at the White House Monday, President Donald Trump doubled down on closing the government over border security.

"As far as the border is concerned and personally, if we don't get border security after many many years of talk within the United States, I would have no problem doing a shutdown. It's time we had proper border security," Trump said. "We're the laughing stock of the world. We have the worst immigration laws anywhere in the world."

"We need border security. Border security includes the wall but it includes many other things. We have to end the lottery. We have to end the chain. The chain is a disaster," Trump continued, adding that the U.S. must end catch-and-release. "I would certainly be willing to close it down...I would certainly be willing to consider a shutdown to get border security."

During his remarks, President Trump also emphasized efforts between Italy and the United States to combat terrorism.

"Today Prime Minister Conte and I are pleased to announce a new strategic dialogue between Italy and the United States that will enhance cooperation on a range of issues," Trump said.

"Our countries have learned through hard experience that border security is national security," he continued. "The Prime Minister and I are united in our conviction that strong nations must have strong borders."

President Trump first issued his threat to shut down the government over the weekend.