WASHINGTON — Sen. Max Baucus, the Montana Democrat who helped Republican George W. Bush win sweeping tax cuts, led the design of President Barack Obama’s health law and then correctly predicted it would be a “train wreck,” is getting a diplomatic plum: Washington is shipping him to China.

Obama said Friday he would nominate Baucus to be U.S. ambassador to China. If confirmed by the Senate, Baucus would become the chamber’s latest contribution to the diplomatic corps, joining former Sen. John Kerry, who is Obama’s secretary of state.

A moderate from a rural, Western state, Baucus is something of an enigma in Washington. He has worked hard to nurture bipartisan relationships in a town that thrives on political fights. He is more conservative than many of his Democratic colleagues, yet he was a key architect of Obama’s signature health-care measure, the most politically divisive law since Bush’s tax cuts in 2001 and 2003. Baucus was also a key player in them.

Congress passed Obama’s health law without a single Republican vote, but not for lack of effort by Baucus. He met for months behind closed doors with GOP colleagues, sometimes to the dismay of Democratic leaders.

Baucus showed his independent streak again in April, stunning fellow Democrats when he said the administration was bungling the implementation of the health-care law.

“I just see a huge train wreck coming down,” Baucus told Obama’s health-care chief during a routine budget hearing.

Republicans immediately latched onto the comment and haven’t let go, repeating it again and again this fall as the rollout of the new “Obamacare” insurance exchanges ran into one disaster after another.

Baucus, 72, was first elected to the Senate in 1978 after two terms in the House. Since 2007, he has chaired the Finance Committee, now the post powerful panel in the Senate with jurisdiction over taxes, trade, Social Security and health care — all among the nation’s most contentious issues.

Baucus rose to the position even though he angered many Democrats when he worked with Republicans in 2001 to enact sweeping tax cuts championed by Bush. He worked with Republicans again in 2004 when Congress pushed through a GOP plan to create a new prescription drug benefit under Medicare.

On China, Baucus more closely shares the views of the White House. He has visited China at least eight times and has hosted trade delegations from the country. At the same time, Baucus has been an outspoken critic of China’s trade practices, complaining that it “effectively bans U.S. beef,” an important export of Montana.

Baucus has also criticized China for manipulating its currency. Many in the U.S. have long complained that China is depressing the value of its currency to unfairly subsidize Chinese exports to the United States while penalizing U.S. exports to China.