Jeanette Rubio stole the show in India in a bright blue dress and white pumps, sparking First Lady whispers as her husband Marco scrambled to smooth Donald Trump's 'hellhole' rift with New Delhi. 

Her starring role comes as Rubio overtakes JD Vance as the favorite to succeed Trump in 2028, with Kalshi punters pricing the Secretary of State at 19 percent against the VP's 17 percent and California Governor Gavin Newsom's 15 percent.

The couple carved out a rare lull in a grueling diplomatic schedule on Monday for sightseeing in Agra, marveling at the ivory-white marble mausoleum built by Emperor Shah Jahan in 1631 to entomb his favorite wife. 

'It's one of the wonders of the world,' Rubio said of the mausoleum in Agra. 'I think it's important to show respect to the culture of the countries that you visit.'

The Rubios later flew to the desert city of Jaipur with US Ambassador to India Sergio Gor and a cohort of senior aides. The delegation ditched their motorcade for open-windowed jeeps, scaling a rugged road to the imposing Amber Fort, former residence of the Rajput Maharajas. 

The reception was nothing short of royal. He was welcomed at the fort by a troupe of twirling dancers in red turbans pounding traditional drums, earning an enthusiastic 'fist of approval' from America's top diplomat.

The opulence continued at their hotel where the couple was greeted by an assembled guard of elephants, white horses and camels, while peacocks fluttered through the manicured gardens.

The sightseeing set the stage for a lavish US Embassy gala in the Indian capital marking America's 250th anniversary. The brainchild of Ambassador Gor - the party pulled out all the stops for its 1,500-plus guests.

The evening featured Bollywood dance numbers and even life-size cutouts of Trump administration officials, allowing enthusiastic attendees to snap commemorative photos. 

Trump dialed into the splashy celebration via speakerphone with Rubio looking on, delivering an effusive message to the crowd. 

'I love India,' Trump said on speakerphone to the energized audience.

The President doubled down on the tightening alliance, drawing roaring applause from the dignitaries and guests. 

'We've never been closer to India,' Trump said to cheers, 'and India can count on me 100 percent.'

Behind the phone-in charm offensive lies a tense diplomatic minefield. 

New Delhi last week slammed as 'inappropriate' a social media post amplified by Trump that branded India a 'hellhole.' 

The online reaction forced America's top diplomat into immediate damage-control mode.

Rubio is now using his high-stakes four-day blitz to repair relations before the rift widens. 

The social media spat is just the tip of the iceberg. 

Relations have strained in recent months after Trump slapped steep tariffs on Indian exports, partly over New Delhi's continued purchases of Russian oil. 

The move angered Indian officials and stoked concerns in Modi's government over Washington's reliability. 

The two countries later reached an interim trade arrangement that eased some tariffs and expanded Indian purchases of US goods, including energy products. But talks on a broader trade deal remain unresolved.

Rubio stressed cooperation on trade, energy, defense and maritime security in Sunday meetings with Indian Prime Minister Narendra Modi and Foreign Minister Subrahmanyam Jaishankar.

He said the countries remained strategically aligned and expressed optimism about a broader trade deal. 

Chief among the concerns is a looming Iran deal hanging in the balance.  

The Iran war has stoked India's energy concerns over shipments through the Strait of Hormuz, a vital route for its crude imports.

Rising fuel costs are squeezing the Indian economy. 

Rubio's four-day trip also includes talks with members from the Quadrilateral Security Dialogue, the Indo-Pacific alliance more commonly known as the Quad: Australia, India, Japan and the United States.

He will also stop in Armenia on Tuesday on his way home.