First local activists sported pink umbrellas on the warm, sunny day and spelled out messages written on their white tee-shirts as they posed in front of the Trump National clubhouse.
Mr Trump spent the afternoon watching the tournament on television, chatting with competing golfers and club managers, posing for photos and flashing thumbs-up signs to spectators who gathered to catch a glimpse of their president in the flesh.
UltraViolet's protest, which began just after 3 p.m., stirred up tensions with some in the crowd.
The most vocal opponent was a woman, who would only be identified as Victoria K., a Taiwanese immigrant who lives in Harding, could be heard yelling "What rights have you lost?" at the protesters, among other things. In many cases, we look at what he was reacting to and whether what he said was accurate.
Trump Supporters Dis CNN at US Women's Open
Trump, who owns 17 golf courses across the globe and is an ardent supporter of the game, apparently warrants being called "controversial host" because earlier in the week one of the LPGA's players, Brittany Lincicome, insulted him saying, "Hopefully maybe he doesn't show up and it won't be a big debacle and it will be about us and not him".
Almost a dozen members of SOMA Action, a six-month-old group from South Orange and Maplewood, arrived wearing shirts saying "Dump sexist Trump".
Another group, We the People NJ-07 - which is made up of members from New Jersey's Seventh Congressional District - was also involved in the day's protests, which included fans holding pink umbrellas. However, after seeing they might cause a distraction for the golfers, the protesters rerouted to a concession stand up the road.
True to form, President Trump updated his Twitter followers regularly over the weekend, interspersing golfing updates with politics and accusations of media releasing fake news. "He may think he has all this power and he's so strong, but we're stronger than he is".More news: Emirates investigating 'champagne incident' recorded in viral video