Well, first of all, there would have to be an actual relationship of some kind between Putin and Trump. So far, all Mueller has is a Porn Star and the publisher of the National Inquirer. Trump’s relation with Putin is no different than that of his relationship with any other national leader.
The wall is one thing the Democrats can’t let Trump have because they want him to be forced to reneg on one of his core campaign promises. Kinda like Bush promising no new taxes.
Obama got an $800 Billion stimulus and nothing to show for it. Trump is only asking less than five billion—maybe less than three billion. But this is the one thing the democrats will hold out on, even it means no border wall, barraging caravans, and clashes at the border to the decimation of the country. The Democrats would love to see this occur on Trump’s watch, so, no border wall. Even if funding was available, there would be Antifa violence,, violence from Central America, and legal obstruction from the left.