Paul Krugman explains why Trump may have massively screwed up Sessions' firing: 'His wall has been breached'

Was President Donald Trump's decision to fire Attorney General Jeff Sessions and replace him with Matthew Whitaker part of a cunning strategy to end the Mueller probe -- or did the president just massively step in it again?

Nobel Prize-winning economist Paul Krugman thinks Trump made an epic mistake with his decision to abruptly ax Sessions and replace him with a hardcore loyalist who even Fox News' top legal analyst believes is legally unqualified for the position.

"Surely the plan was always to kill the Mueller investigation after the midterm," Krugman speculates. "But this was probably envisioned as something to go along with a GOP House that would block all other inquiry. Trump's anger over the loss may have moved him to act without thinking things through."

Krugman goes on to explain that Trump can no longer simply bury the Mueller probe now that Democrats have retaken the House -- and his efforts to do so now may only add to the legal jeopardy he faces for obstruction of justice.

"With a Dem House Trump can't really kill the inquiry -- because now people with subpoena power can call Mueller and colleagues for testimony, and get the facts out anyway," he writes. "In fact, this could be worse than letting Mueller finish and then sitting on the report."

The bottom line, Krugman argues, is that Trump is "not a dictator" -- and now "his defensive wall has been breached."

Read the whole tweet storm below.