doorstop

noun

Etymology: From door + stop.

1. Any device or object used to halt the motion of a door, as a large or heavy object, a wedge, or some piece of hardware fixed to the floor, door or wall.
2. A large book, which by implication could be used to stop a door.

   “Meanwhile, all the Democrats had to put forward that year was a doorstop called Man of the House: The Life and Political Memoirs of Speaker Tip O'Neill.”

   “Walter Isaacson’s insight-free doorstop makes at least one thing clear: the richest man in the world has a lot of growing up to do[.]”

3. Eggcorn of doorstep.
4. An interview with a politician or other public figure (apparently informal or spontaneous but often planned), as they enter or leave a building.

   “And television dominates this place — just look at Beazley tossing around cans of tomato soup at his morning doorstops outside Parliament House.”

   “The six o′clock news was regarded as the pivotal point in the day. As the news was beginning, often the Premier would make himself available for a doorstop press conference.”