This is a big deal simply because Grassley has been an ally of Trump and he could have stopped this.
"The Senate Judiciary Committee is planning on opening an investigation into the events surrounding President Donald Trump’s firing of former FBI Director James Comey, The Wall Street Journal reported on Wednesday.
The investigation could potentially examine whether the president interfered in the ongoing Russia investigation by moving to fire Comey.
“The Judiciary Committee has an obligation to fully investigate any alleged improper partisan interference in law enforcement investigations,” Sen. Chuck Grassley, R-Iowa, said in a letter announcing the move."
Comey firing to be investigated by Senate panel, new report says | Fox News