These agencies were "weaponized" by the Democrats during the Obama administration and now have become politically corrupt enemies of Republicans.
Time to clean house.
I'm sure all of the enemies of the USA would like to see that happen. After all, they are the governmental agencies who are charged with upholding the Constitution. Trump has already fired all of the leadership of DHS, with acting leaders in some but not all of the agencies. Those who refuse to break the law on the President's orders and separate families in violation of court orders, were fired.
Similarly, the Department of Justice has been decimated. Trump is dismantling all of the legal and law enforcement departments charged with keeping Americans safe. Why? Because government workers continue to report on Trump's illegal activities, and dishonest and dangerous behaviour.
And because Putin wants him to.