Wall Street's main indexes were subdued on Friday, but were still on track for robust weekly gains buoyed by a U.S.-China tariff truce and cooling inflation, while focus was on a pivotal vote on President Donald Trump's tax legislations. U.S. equities lost some steam after a measure of consumer sentiment by the University of Michigan slipped to 50.8 for May, compared with April's 52.2, while one-year inflation expectations surged to 7.3% from 6.5%. House Budget Committee Chairman Jodey Arrington cautioned that Friday's planned vote on the tax bill might be delayed due to opposition to the measure.