A key Republican lawmaker demanded on Friday that the Obama administration implement tougher sanctions against North Korea after its Thursday nuclear test of its largest nuclear bomb so far.

House Foreign Affairs Committee Chairman Ed Royce, R-Calif., said the test shows the U.S. needs to be tougher on North Korea, and blamed the Obama administration for failing to implement the sanctions options approved by Congress just this year. He said the U.S. needs to impose more penalties, in particular against Chinese companies that are helping North Korea.