Warren raises questions about widening trade deficit with South Korea

Hochberg, who was tapped by President Obama for a second four-year term, said he has dealt with Korean Airlines and renewable solar energy companies. 

"We don't have a strong book of business with Korea," said Hochberg, who said he has plans to travel there later this year. 

He told the panel that his goal during that trip will be to convince "formidable" Korean infrastructure companies to start buying form the United States.

Warren's concerns come a day ahead of a joint meeting of Congress with South Korean President Park Geun-hye. 

Park, who was elected in December as the first female president of the nation, is meeting with Obama on Tuesday. The last South Korean president, Lee Myung-bak addressed Congress in October 2011, just after lawmakers cleared the trade pact. 

A year after the implementation of the U.S.-Korea free trade agreement, which was cheered on its passage, Warren said she has "noticed the facts have not worked out so clearly." 

While U.S. imports grew globally by 5 percent, imports were up 17 percent from Korea, and while U.S. exports were up 11 percent, they decreased by 5 percent to Korea. 

A separate analysis released by Public Citizen on Tuesday, shows that exports to Korea are down 10 percent during the trade pact's first year, compared with before, while the trade deficit surged by 37 percent. 

During that time, U.S. imports from Korea have climbed 2 percent.

The last time the United States was in the black with Korea was 1997, according to government statistics. 

Trade has picked up in the past decade, and the gaps have remained relatively steady since 2000, ranging from as low as $12 billion to a high of nearly $20 billion in 2004. 

Last year, the deficit was $16.5 billion and has already eclipsed $4.6 billion this year. 

"The Korea pact’s damaging outcomes being the opposite of the administration’s promises will certainly complicate the administration’s current efforts to use the same claims about export expansion to persuade Congress to delegate away its constitutional trade authority or to build support for the administration’s next trade deal, a massive 11-nation Trans-Pacific Partnership (TPP) based on the same model,” said Lori Wallach, director of Public Citizen’s Global Trade Watch.

Many of the sectors that the Obama administration promised would be the biggest beneficiaries of the Korea deal have lost in the deal, Wallach said. 

U.S. pork exports have declined 24 percent, beef exports are down 8 percent and poultry exports have plunged 41 percent.

The analysis noted that the deficit with Korea in autos and auto parts increased 16 percent during the trade deal's first year.