The 2018 budget proposal as presented by the Trump administration today calls for significant cuts to federal spending across the board, and features only a modest request to begin construction on the controversial “Trump border wall” along America’s southern border.

The wall, which became a source of controversy during the campaign, has long been a central theme in Trump’s candidacy and short time as president. Early cost estimates produced by the Department of Homeland Security floated a price tag of around $21.6 billion. The funding proposal on Tuesday called for just $1.6 billion to begin construction.

Trump faces opposition from fiscal conservatives in the House Freedom Caucus, who are critical of the high price tag. Democrats oppose the wall strictly along partisan lines.

Opposition to the wall forced the administration to pull complete funding from this year’s budget, but the goal of constructing the wall remains fixed. “”We are absolutely dead serious about the wall,” said White House budget director Mick Mulvaney during a press conference today.