Trump Goes on a Spending Diet

He promised no more Obama-size deficits. Can he lean on GOP lawmakers to deliver?

If the Trump White House has a congressional ally in its latest big objective, it’s Rep. Tom Graves. The Georgia Republican is an appropriator, though not a business-as-usual spender. That’s exactly the administration’s new message: We’re done with the usual.

With the economy reaping the fruits of tax cuts and regulatory reform, the Trump administration looks to be getting serious about a neglected campaign promise: spending restraint. Publicly, it’s laying out a strategy to roll back the bloat in last year’s omnibus. Privately,...