US Federal Reserve boss, Alan Greenspan, sees increased US trade protectionism and ever-larger budget deficits as the biggest threats to the US economy.
U.S. trade protectionism is a threat to the economy.
( z1 threaten :ARG0 ( z2 protectionism :mod ( z3 trade :ARG0 ( z4 country :name ( z5 name :op "U.S." ) ) ) ) :ARG2 ( z6 economy ) )