WASHINGTON (Reuters) - President George W. Bush said on Tuesday he is "concerned" about high gasoline prices, and pledged that the U.S. government will keep a close watch out for profiteering. "I'm concerned about higher gasoline prices," Bush said at a Rose Garden news conference to name new staff appointments. "The government has the responsibility to make sure that we watch very carefully and investigate possible price-gouging, and we will do just that," Bush said in unprompted remarks about energy prices. U.S. crude oil futures hit a record of $70.88 a barrel on Tuesday on fears of supply disruptions in...