Two of U.S. President Donald Trump's sons arrived in the United Arab Emirates for an invitation-only ceremony Saturday to formally open the Trump International Golf Club in Dubai.

It's the Trump family's first new property launch since the inauguration and subsequent travel ban, which doesn't affect Dubai, part of the United Arab Emirates.

Despite anger from many Muslim leaders in the U.S. and abroad over the President's travel ban on seven Muslim-majority nations, his sons were warmly welcomed emirate for the opening of the ritzy golf course.

The UAE's foreign minister even backed Trump's travel ban earlier this month, which didn't include the UAE or neighboring Saudi Arabia. All but four of the September 11 hijackers came from Saudi Arabia, while two came from the UAE.

On Saturday afternoon, Trump sons Eric and Donald Jr attended a private luncheon with billionaire developer Hussain Sajwani, who runs local Trump Organization partner firm DAMAC Properties.

DAMAC Properties chairman Hussain Sajwani (far right) hosts Donald Trump Jr (second right) and Eric Trump (second left) for a private luncheon Saturday. Also pictured are Banke International directors Niraj Masand (far left) and Porush Jhunjhunwala (center)

'Hussain, he is an amazing person,' said Eric Trump at the luncheon in the billionaire developer's villa on the Palm Jumeirah artificial island chain (pictured)

Eric Trump attends the opening ceremony of the Trump International Golf Club in Dubai

'It's rare in the world where you can be such great friends with a partner and that's what we have right here,' Eric Trump said, speaking in the billionaire's mansion on the ritzy man-made island archipelago Palm Jumeirah.

An ornamental clock hung above the brothers, with the face spelling out 'SANJWANI VILLA.'

'Hussain, he is an amazing person and DAMAC is an amazing company,' Eric Trump continued.

'We are going to have a lot of fun years together and this is just the beginning of those days,' he added of Sanjwani later Saturday.

Sajwani and his family also attended a New Year's Eve celebration at Trump's Mar-a-Lago club in Florida, where Trump referred to them as 'the most beautiful people from Dubai.'

Trump days later told journalists that DAMAC had offered the Trump Organization $2 billion in deals after his election, adding that he turned it down because he didn't want to 'take advantage.'

One of the Trump Organization's subsidiaries received from $1 million to $5 million from DAMAC for running the golf club, according to a U.S. Federal Election Committee report submitted in May.

The 18-hole course has raised questions about how the Trump Organization's many international business interests will affect the administration of America's 45th president.

Already, a liberal-funded watchdog group has filed a lawsuit alleging his business violates the so-called emolument act of the U.S. Constitution. Similar questions have been raised by legal experts over Trump's Dubai course.

The Trump organisation would not enter into any new overseas deals while he is president, Trump adviser Sheri Dillon has said.

On Sunday evening, Eric and Donald Trump Jr attended a glitzy opening ceremony at the new course, featuring fireworks and a classical music ensemble.

Fireworks explode during the opening of the Trump International Golf Club in Dubai

People take pictures of fireworks during the inauguration ceremony of the Trump International Golf Club in Dubai on Saturday Night

Donald Trump pictured with daughter Ivanka on a 2008 visit to Dubai. Although Trump has handed sons Eric and Donald Jr control of his sprawling real estate empire, ethics watchdogs have raised conflict-of-interest concerns over Trump Org's many international deals

A giant billboard advertising the Trump International Golf Club hangs in Dubai on Saturdy. Two of President Donald Trump's sons are in Dubai for an invitation-only ceremony to open the Trump International Golf Club in Dubai on Saturday

Some 100 Trump-branded villas on the golf course complex sell from 5 million dirhams ($1.3 million) to over 15 million dirhams ($4 million)

The private opening ceremony drew more than 1,500 invitees, according to Gulf News.

Speaking on a stage in front of the clubhouse, Donald Trump Jr praised the development of the UAE, a close U.S. ally that is also a global trade, transport and tourism hub.

'To see the incredible vision Sheikh Mohammed has been able to put forward for this country is truly awe-inspiring,' he said, referring to Dubai Emir and UAE Prime Minister Sheikh Mohammed bin Rashid al Maktoum.

'As a developer, which lets us be somewhat artists at times, it is truly incredible to be part of that vision.'

The 7,205-yard course on the outskirts of Dubai was designed by Gil Hanse, who also designed the course for the 2016 Olympics in Rio. Some 100 Trump-branded villas on the property sell from 5 million dirhams ($1.3 million) to over 15 million dirhams ($4 million).

The launch ceremony in Dubai, home to the world's tallest building and other architectural marvels, marks the first major event abroad that the two Trump sons have attended together since their father's inauguration on January 20.

Donald Trump is seen playing golf on a billboard at the Trump International Golf Club Dubai in this file photo from 2015

Eric and Donald Trump Jr., who now run the Trump Organization, receive Secret Service protection as immediate family members of the president.

Experts already have warned the Trump brand abroad now faces a global terror risk.

However, the United Arab Emirates, a staunch U.S. ally in the war against the Islamic State group and host to some 5,000 American military personnel, remains a peaceful corner of the Middle East.

Trips abroad by Trump's two sons are expected to continue.

Before Trump's inauguration, his son Eric visited the Trump Tower Punta del Este in Uruguay to check on the tower's progress and personally greet buyers.

A Trump hotel in Vancouver, British Columbia, is also expected to soon host Trump's sons.