After a late start and an early exit in the 2016 campaign, Gov. Scott Walker spent time this week at the Republican National Convention laying vital groundwork should he run for president again.

At this point, Walker — who is scheduled to address the entire convention Wednesday night — said the only potential campaign he’s thinking about is a third run for governor in 2018, but he won’t rule out another national run in 2020, 2024 or even 2036.

“I could wait 20 years and still be younger than Hillary Clinton and Donald Trump,” Walker told reporters Tuesday after speaking at a South Carolina delegation breakfast. “From my standpoint, I’m in no rush. We’ll see what God’s calling is in all of this.”