For months, United States Steel argued that selling out to Japanese-owned Nippon Steel was the only way to survive. President Joe Biden thought different, concluding that even a takeover by a company based in close ally Japan wasn*t enough to allay national-security concerns.

Such is the new politics of global trade and investment.

In blocking the deal Friday, Biden pointed to what he said was ※credible evidence§ that Nippon Steel*s $14.1 billion bid would ※create risk for our national security and our critical supply chains.§ He didn*t say what the evidence was, though he invoked the Defense Production Act, which gives the president power over the economy to ensure the supply of critical goods.