Treasury Secretary Janet Yellen ’s push to elevate economic ties with Vietnam , on display with a high-profile trip this week, is drawing fire for seeking to strengthen US supply chains by replacing one repressive country with another. Yellen, who in December wrote, “We must shift away from supply chains that violate core human rights” — a reference to documented abuses in China — is meeting Vietnam’s prime minister, finance minister, central bank governor and chair of its national assembly on a three-day visit to Hanoi. The trip highlights what Yellen on Friday described as Vietnam’s “trusted-partner” status in building “secure and reliable supply chains.”