CALEXICO, Calif. — Declaring “our country is full,” President Donald Trump on Friday insisted the U.S. immigration system was overburdened and illegal crossings must be stopped as he inspected a refurbished section of fencing at the Mexican border.

Trump participated in a briefing on immigration and border security in Calexico before viewing a 2-mile see-through steel-slat barrier that was a long-planned replacement for an older barrier. “There is indeed an emergency on our southern border,” Trump said at the briefing, noting an uptick in illegal crossings. “It’s a colossal surge, and it’s overwhelming our immigration system. We can’t take you anymore. Our country is full.”

As Air Force One touched down in the state, California and 19 other states that are suing Trump over his emergency declaration to build a border wall requested a court order to stop money from being diverted to fund the project. But Trump, who ratcheted up his hard-line immigration rhetoric in recent weeks, declared that his move, which included vetoing a congressional vote, was necessary.

Also on Friday, House Democrats filed a lawsuit preventing Trump from spending more money than Congress has approved to erect barriers along the southwestern border. Congress approved just under $1.4 billion for work on border barricades. Trump has asserted he can use his powers as chief executive to transfer an additional $6.7 billion to wall construction.

Trump, who earlier in the week threatened to shut down the border over the high numbers of migrants trying to enter the U.S., appeared to walk back his comments, saying it was because Mexico had gotten tougher in stopping an influx of immigrants from moving north.