U.S. stock index futures rose on Friday, keeping Wall Street on track to end the week on a positive note, marked by a U.S.-China tariff truce and soft inflation data, while investors focused on a likely vote on President Donald Trump's sweeping tax bill.

U.S. stock index futures fell on Monday, while Treasury yields rose after ratings agency Moody's downgraded the country's sovereign rating by one notch, bringing forward concerns around the ballooning U.