Broadcom, which is based in Singapore, has its co-headquarters in San Jose, and is in the process of moving its entire legal headquarters to the United States this year.
Mir noted that Chinese companies such as Huawei, which is also the No. 3 smartphone maker, have increased their engagement in 5G's development and that Huawei owns about 10 percent of 5G essential patents.
The Committee is particularly concerned that if Qualcomm does not maintain its position as one of the top investors in semiconductor research, it could lose its leading position in helping to determine global industry standards.
The company said Wednesday that it expects the move to be completed by May.
In the letter, Treasury officials said Broadcom could take a "private equity" style direction if it acquires Qualcomm, which means reducing long-term investments, such as research and development, and focusing on short-term profitability, the letter said.
In a statement Wednesday, Broadcom said, "with its proven track record of investing in and growing core franchises, Broadcom is committed to making the USA the global leader in 5G".
Now, with Qualcomm using the CFIUS investigation as reason to push back the shareholder vote on the acquisition until at least April, Broadcom is launching its own charm offensive and pledging to pour money into the United States research and education fields with its $1.5bn fund promise.
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There's been yet another twist in the ongoing saga of Broadcom's attempt to take over Qualcomm.
In its letter, treasury heaped praise on Qualcomm for having "led the mobile revolution in digital communications technologies". "This measure will afford CFIUS the ability to investigate fully Broadcom's proposed acquisition of Qualcomm". That's a concern for the government, as Qualcomm is critical to maintaining the US's position of leadership in semiconductors and wireless networking.
Broadcom said it is run by a board of directors and senior management team consisting nearly entirely of Americans.
On Wednesday, Broadcom tried to assure regulators that it is emphasizing investments in research and development.
"CFIUS, during the investigation period, will continue to assess the likelihood that acquisition of Qualcomm by Broadcom could result in a weakening of Qualcomm's technological leadership in a manner that is detrimental to USA national security", the letter said.
Qualcomm's shares slipped 41 cents to $64.33, while Broadcom's were down $1.46 at $249.41.