Sen. Chuck Grassley of Iowa. Andrew Harnik-Pool/Getty Images Republicans launched attacks against the Biden stimulus plan during the Yellen confirmation hearing on Tuesday. Sen. Chuck Grassley called it a "laundry list of liberal structural economic reforms." The hearing likely presages the staunch opposition many parts of Biden's economic agenda will encounter on Capitol Hill. Visit Business Insider's homepage for more stories. Senate Republicans ratcheted up their criticism of President-elect Joe Biden's economic rescue package on Tuesday, indicating it will likely encounter strong resistance among GOP lawmakers wary of backing more federal spending.During the confirmation hearing for Janet Yellen - Biden's pick for treasury secretary - Republicans tried putting her on the defensive on Biden's $1.9 trillion economic aid plan.