LONDON — President Trump has singled out the U.K. as one of the countries that he says needs to pay more for medicines to help bring down the prices in the U.S. His visit to the country this week happens to come as a domestic spat about drug prices is boiling over.

The U.K. does not pay as much for drugs as pharma companies believe it should, and those companies have in turn warned they may cut their investments here. Those warnings turned into a rude reality for the country in the past week, as Merck, AstraZeneca , and others all bailed on or paused major projects, with Merck pulling out of a $1.3 billion research center in London that is well under construction.

“It’s looking like there’s a sort of contagion,” one member of Parliament said at a hearing this week that was called t

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