The travel ban preventing citizens from seven predominantly Muslim nations from travelling to the United States has sparked outrage across the globe.

But one voice that has yet to be heard speaking out against the ban is that of Prime Minister Najib Abdul Razak.

Najib is often quick to react to international incidents through his Twitter account, condemning terrorist attacks and issuing condolences within hours or a day of the incidents taking place.

Many are expecting him to say something on the travel ban enacted on Friday, especially after his bravado in lashing out at Myanmar and its de facto leader Aung Saan Suu Kyi over the violence against Rohingyas.

"Najib should send the strongest objection to Trump on the travel ban - in particular its effects on refugees from war torn countries - specifically Syria where millions are suffering from the conflict there.

"He shouldn't just voice objections to Myanmar," PKR international bureau chief Gooi Hsiao Leung told Malaysiakini.

Political analyst Wan Saiful Wan Jan explained the current silence as being a normal part of international diplomacy.

"When it comes to foreign policy it has to be considered carefully, a statement can't be made just like that," Wan Saiful said.

He added that there should only be cause for complaint if nothing is said within the next one or two weeks.

One of the issues that needs to be weighed, he said is Malaysia's ties with the US.

Malaysia is a strategic partner for the US in its fight against terrorism in the Asia Pacific region.

Najib and Trump also share close ties, with the two being described as golfing buddies.

Najib has a signed photo of Trump with the words "To my favourite Prime Minister" in his office.

Trump however is known to be a loose cannon, reacting angrily to criticism against him.

No potential negative impact

But Wan Saiful said ties with the US will remain solid even if Najib speaks out against the travel ban.

"I don't see any potential negative impact if he criticises the move.

"I think (US-Malaysia ties) is a major concern, the relationship will continue anyway," he said.

Likewise, Gooi said Najib should not be afraid of losing Trump's confidence by voicing out against a "cruel and inhumane" act against refugees.

Amanah deputy president Salahuddin Ayub meanwhile said this will be a test for Najib.

"The people are waiting to see if Najib is brave enough to act as we hope he will," Salahuddin said when contacted.

Trump on Friday enacted the travel ban for seven Muslim countries namely Iraq, Syria, Iran, Yemen, Sudan, Libya and Somalia.

The ban is in place for all citizens of the country regardless of faith.

The executive order also stymies entry for refugees.

Following this, there have been reports of citizens of these countries being turned back upon arrival on US soil.

A federal US judge has since granted a stay on the ban, following a lawsuit filed by two Iraqis detained at New York's JFK airport.