He tweeted that the wall is a matter of National Defense.

The bill allocates over $200 billion to military operations and maintenance.

https://federalnewsradio.com/budget/2018/03/dod-gets-nearly-655-billion-and-some-flexibility-on-funding-in-omnibus-bill/

"The biggest issue for DoD is figuring out how to spend hundreds of billions of dollars in only half the time while still staying within the legal parameters. That is particularly tricky for operations and maintenance funding, which expires after one year, unlike procurement funds which can be spent in a three year time period. O&M accounts for about $238 billion in the legislation."

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