Donald Trump has vowed to unleash the full power of fossil fuels in US energy policy, warning that restrictions proposed by Democrats would leave the US “begging for oil” from the Middle East. In his most extensive remarks on energy to date, the Republican candidate — who hasturned his back on party orthodoxy in many other areas — adopted mainstream party positions favouring fossil fuels with less regulation and more production. His remarks on Thursday were reassuring to oil executives who were unsure how Mr Trump would treat the sector, and bore the imprint of advice he said he had received from Harold Hamm, chief executive of Continental Resources, a shale pioneer. Attacking his Democratic rivals Hillary Clinton and Bernie Sanders for wanting to impose stricter regulations on fracking, the real estate mogul said: “You do that and you’ll be back into the Middle East and we’re going to be begging for oil again. It’s not going to happen. Not with me.” Mr Trump also said he wanted to “cancel” last year’s Paris climate change accord, roll back federal regulations, revive the moribund coal industry, and see the controversialKeystone XL oil pipeline built. He sought to tie energy into his campaign narrative of US revival and attacked President Barack Obama and Mrs Clinton, the Democratic frontrunner, for putting foreign interests ahead of the US.