That's easy.There's a difference between spin and a bare-faced lie.
I can't figure out how he pulls it off without more people being upset. Spin would be "We've made more progress on the border fence than any previous administration". That's got some wiggle room. But to say something that's 5% complete is "basically complete" is just a lie.
1) See who is in power.
2) The other team will get angry.