Greg Mankiw and Phillip L. Swagel write,

In February, seven of nine newly elected senators publicly endorsed the Byrd Amendment, a provision that encourages American companies to file antidumping lawsuits by awarding the revenues collected from the resulting tariffs to the litigating companies.

… If a foreign firm sells its product in the U.S. market at too attractive a price, domestic firms can threaten it with an antidumping suit that will lead to hefty tariffs and higher prices.

It is easy to see why anti-dumping is, as Mankiw calls it, a “third rail” that no politician wants to touch. Asking a politician to come out against rent-seeking is like asking a prostitute to come out against exchanging money for sex.