LONDON -U.S. oil and gas producers are unlikely to radically increase production under president-elect Donald Trump as companies remain focused on capital discipline, a senior executive at Exxon Mobil said on Tuesday. "We're not going to see anybody in 'drill, baby, drill' mode," Liam Mallon, head of Exxon's upstream division, told the Energy Intelligence Forum conference in London. "A radical change (in production) is unlikely because the vast majority, if not everybody, is focused on the economics of what they're doing," he said.