The day after US President Joe Biden announced his resignation, Israeli Prime Minister Benjamin Netanyahu was en route to Washington on Monday to deliver an important address at a time of "great political uncertainty", as the military ordered new evacuations in the southern Gaza city of Khan Yunis. The visit comes amid heightened tensions between the US and its long-standing ally, with fears of the Gaza war once again fuelling regional violence as Israel on Saturday attacked Yemen for the first time, in retaliation for a deadly drone strike on Tel Aviv by the Huthi rebels.