The Treasury's Committee on Foreign Investment in the United States said Sunday it has confirmed the national security concerns it has raised about the deal and said it would consider further action, including referring the matter to President Donald Trump.
Broadcom is battling for board seats at Qualcomm, which has resisted its hostile takeover attempt. The government has said it is concerned about Qualcomm's ability to maintain a competitive edge over China in mobile network development, citing Broadcom's reputation for cutting research spending.
In response to that claim, Broadcom said earlier this month it is fully cooperating with CFIUS and was "absolutely committed" to making the combined company a leader in 5G technology, the next generation mobile network.
Sunday's letter to lawyers for the two chipmakers said Broadcom violated the government's previous order by making moves to relocate its headquarters to the United States from Singapore without giving CFIUS five days notice, as required. Broadcom made these moves three times, according to the letter, which was reported by CNBC's David Faber on Monday.
The investigation should be ending soon, the CNBC report said. If Broadcom moves its headquarters before the review is over, CFIUS could potentially lose its jurisdiction over the deal.
Broadcom officials are meeting with CFIUS on Monday to tell them why it should not refer the deal to the president to be blocked, CNBC reported.
Shares of Broadcom rose 2.9 percent on Monday, while shares of Qualcomm dipped slightly, down 0.9 percent.