WASHINGTON (Reuters) -A bipartisan group of lawmakers said on Monday they have agreed on a proposal that would give the U.S. government sweeping new powers to block billions in U.S. investment into China, although the measure is part of a broader bill with an uncertain future. The provision is part of broadbased legislation to boost U.S. competitiveness with China and also grant $52 billion to chipmakers to expand U.S. operations. “The refined proposal released today has bipartisan, bicameral support and addresses industry concerns, including the scope of prospective activities, industries cov…