Australian Prime Minister Tony Abbott listens to a question in the Australian Parliament located in the Australian capital city of Canberra February 23, 2015. Abbott on Monday announced a national security crackdown that could deny welfare payments to people seen as potential threats, strip the passports of those with dual nationality and curb travel overseas. Abbott, bruised politically and facing pressure for dramatic action after surviving a leadership challenge this month, unveiled the measures in the wake of a hostage siege in a Sydney cafe that left three dead in December. REUTERS/David Gray (AUSTRALIA - Tags: POLITICS)