Evidently, Trump wants to spend much of 2018 campaigning for midterm candidates, and plans to "travel extensively and hold rallies." First thought: Shouldn't the president be presidenting? Second thought: Maybe we're better off if this one isn't. https://www.washingtonpost.com/amphtml/politics/after-alabama-loss-trump-has-ambitious-plans-to-campaign-in-2018-midterms/2017/12/16/d76d5b40-e1d1-11e7-bbd0-9dfb2e37492a_story.html?utm_term=.dfbfa20ec2ec&__twitter_impression=true …
It'll probably end up costing about the same as any other presidential travel, such as to his private properties, so I don't think the campaign travel will spend substantially more or less than he would have spent otherwise.