US envoy calls enrichment ‘red line’ ahead of new Iran talks

The United States and Iran will hold a new round of nuclear talks Sunday in Oman ahead of a visit to the region by Donald Trump, whose key negotiator staked out an increasingly hard line on the issue of uranium enrichment.

Trump, who will visit three other Gulf Arab monarchies next week, has voiced hope for reaching a deal with Tehran to avert an Israeli military strike on Iran’s nuclear program that could ignite a wider war.

Three previous rounds of talks in Oman and Rome ended with notes of…