WASHINGTON — President Trump said Saturday that he wants Congress enact a measure to provide legal status to young, undocumented immigrants — provided his other immigration proposals, including funding for the wall on the US border with Mexico, are adopted.

“We want the wall,’’ Trump said at a press conference at Camp David in Maryland. “The wall is going to happen, or we’re not going to have DACA,’’ he said, referring to the Deferred Action for Childhood Arrivals program, which Democrats are fighting to restore.

In addition to funding the wall, Trump detailed other immigration policies he wants to be part of any package including DACA, which was authorized by President Obama in 2012 through an executive order overturned in September.

Trump reiterated his push to eliminate family reunification or “chain migration’’ provisions in current law that give preferences to family members of legal immigrants, and the immigrant visa lottery system.

“We all want DACA to happen, but we also want great security for our country,’’ Trump said. He added that, “in some form, Mexico will pay for the wall.’’

Republican leaders convened at the presidential retreat in rural Maryland to map out their legislative priorities for 2018. Trump said Saturday that these included included national security, infrastructure, military funding, and immigration.

The president also said he wants to address the problem of drugs ‘‘pouring into this country and how to stop it.’’

“We’re going to have some really great bipartisan bills,’’ Trump added. “But we need more Republicans.’’

Trump appeared to back away from efforts to overhaul the welfare system, which just weeks ago had been identified as one of the White House’s top two legislative priorities, along with an infrastructure investment plan.

Senate majority leader Mitch McConnell of Kentucky has said welfare reform is a no-go given Democratic opposition. And Trump appears to have come around.

‘‘It’s a subject that’s very dear to our heart,’’ Trump said Saturday. ‘‘We'll try to do something in a bipartisan way. Otherwise, we'll be holding it for a little bit later.’’

Republicans are eager to add to the victory they achieved late last year with the overhaul of the nation’s tax code. But that drive also put off other issues, among them funding the federal government.

In just two weeks another funding deadline awaits, and Republican and Democratic lawmakers remain at odds over increasing spending for defense and nondefense agencies.

Trump said he plans a robust schedule of campaigning ahead of the 2018 midterm elections — including primary elections — but said he is done campaigning for insurgents challenging incumbent Republican members of Congress.

The president said he will be ‘‘very involved’’ with both House and Senate races, and will campaign for incumbents and ‘‘anybody else that has my kind of thinking.’’

After a stinging GOP loss in a special Senate election in Alabama, Trump said he will no longer back challengers, declaring: ‘‘I don’t see that happening.’’

Trump had supported Roy Moore, who lost the Alabama election, handing Democrats another seat in the Senate.

Trump has thrown his support behind Republican incumbents seeking reelection this year, such as Senator Roger Wicker of Mississippi.

But Trump has also tried to influence Republican primaries. He has publicly predicted that his longtime supporter Representative Lou Barletta, Republican of Pennsylvania, ‘‘is going to win big’’ in his competitive Senate primary in that state.

Several other Republican primary races for Senate — in Arizona, Nevada, and an expected contest in Mississippi — have become proxy fights for the battle between McConnell and conservative activists, including former White House strategist Stephen Bannon.

Trump’s fierce criticism of Senator Jeff Flake of Arizona helped to force him into retirement.

The White House has had mixed results in recruiting Republicans to challenge Democratic inumbents in the Senate.

In nine of 10 Trump-won states where a Democratic senator is up for reelection, Republicans are facing free-for-alls with no obvious front-runners. An exception is Missouri, where Attorney General Josh Hawley is favored to beat three insurgent challengers.

Overall, 2018 will offer one of the most wide-open primary seasons in decades.

Between March 6 in Texas and Sept. 18 in Massachusetts, thousands of contenders, Republican and Democrat, will compete at every level of elected office below the presidency for the chance to appear on the ballot in November.