good evening. in a notable hardening of tone, president biden has told israel s prime minister, benjamin netanyahu, that washington s future support for his war in gaza will depend on israel taking new and immediate action to protect civilians and aid workers. it was their first phone conversation since an israeli air strike killed seven aid workers including three british nationals in central gaza on monday. mr biden called it unacceptable and urged israel to take steps towards an immediate ceasefire. it s the first time there has been a public warning to israel about us support. in a moment we ll speak to our correspondent in jerusalem, lucy williamson. but first to our north america correspondent, gary 0 donoghue. gary, a significant shift from president biden here. reeta, there s been mounting president biden here. reeta, there s been mounting in president biden here. reeta, there s been mounting in patients president biden here. reeta, there s been mounting in p