Josh Frydenberg is drawing renewed attention about a return to federal politics while promoting his memoir, "A Grateful Son." The reception among colleagues has been lukewarm, and Barnaby Joyce was blunt, calling a Frydenberg leadership push "very bad." John Howard drew attention at the book launch with a cheeky remark about his former treasurer's ambitions.

Some political commentators have sided with Frydenberg over other potential Liberal candidates, but no formal move has been announced. Frydenberg has also pushed back on criticism of the spending that occurred under his watch as treasurer, bringing budget decisions back into focus alongside the leadership speculation.