President Obama on Wednesday will offer sweeping new gun restrictions — including a proposed ban on assault weapons — that herald a fierce battle with gun-rights advocates on Capitol Hill.

The package will also include a ban on high-capacity ammunition magazines and expanded background checks for gun buyers, the White House announced Tuesday. The proposals will be unveiled at an 11:45 a.m. event attended by pro-gun-reform lawmakers and interest groups.

Gun reform has been a third rail in Washington for many years, but there’s some indication that Obama intends to use his bully pulpit to pressure Congress on the issue in a manner that hasn’t been tried in decades.