"With the current Trump 'ban' I feel a world event in Los Angeles is not truly a 'world' event. Needless to say I won't be going," the post said.
New Zealand will not be sending any paracyclists over to the World Championships next month.
Paralympics New Zealand communications manager Melissa Dawson said that the limited time given to prepare for a world competition ultimately made the decision for them.
"The International Cycling Union (UCI) came out with all the dates for all competitions last year and the Los Angeles meet was not included," she said.
"Seven weeks before this event they came out with all the dates and information. With that in mind while planning high-performance events, we couldn't send anyone to this event at all.
"There will be numerous events leading into the 2020 Tokyo Paralympics for our athletes to gain qualification and there will also potentially be opportunities to gain Commonwealth Games entry."
There is controversy surrounding President Trump's recent executive order which severely restricts immigration from seven predominantly Muslim countries, suspends all refugee admission for 120 days, and bars all Syrian refugees indefinitely.
Dawson said this did not sway their decision to not go either way.
"The Trump factor didn't come into it. It isn't relevant to our decision to not go at all," she said.
"At the end of the day, you can't mount a successful high-performance campaign with only seven weeks of preparation.
Foy is coming off a successful Paralympic campaign, securing a silver medal in the women's B 3000m individual pursuit and a bronze in the road cycling women's race with her partner Laura Thompson.