“It was not done in the Obama administration, so by funding the authorization that’s already happened a decade ago, we could start the process of meeting Mr. Trump’s campaign pledge to secure the border,” Indiana Republican Rep. Luke Messer said on Thursday. If Mexico refuses to pay for the wall, the GOP could add billions of dollars into the spending bill that needs to pass by April 28 but this could also force a government shutdown. Congressional Republicans are exploring ways to begin funding. Multiple lawmakers described the plans Thursday, which would use authority under a 2006 law supported by Republicans and Democrats. The cost could eventually reach into billions of dollars.