U.S. drugmaker Merck said on Tuesday it is investing $1 billion in a new Delaware plant to expand domestic production as it prepares to deal with President Donald Trump's tariffs. The new facility will produce biologic drugs and Keytruda,

Merck, the New Jersey-based drug giant, is spending $1 billion on a new Delaware factory to bring production of its best-selling cancer drug Keytruda to the U.S. and speed future drugs to market. Keytruda is currently made in Ireland and by contract manufacturers in the United States.