USA - Donald Trump has been warned he cannot declare war without congressional support following the bombing of Saudi Arabian oil facilities. The strikes, which destroyed half of the kingdom’s oil production capacity, were claimed by Iran-backed Houthi rebels in Yemen. On Sunday night Mr Trump said the US was “locked and loaded” and believed it knew who was truly behind the attack. But Bernie Sanders, who is gunning for the Democratic nomination for president, tweeted: “Mr Trump, the Constitution of the United States is perfectly clear. Only Congress — not the president — can declare war. And Congress will not give you the authority to start another disastrous war in the Middle East just because the brutal Saudi dictatorship told you to.”