Donald Trump was preparing for the G7 summit in France when he learned that one of his most ardent suitors was trying to reach him. Brazilian president Jair Bolsonaro needed a favour, and Trump told aides to patch the call through.

Bolsonaro got right to the point: The powerful G7 countries, including France and Canada, were unfairly ganging up on Brazil over their criticism of his government's response to massive fires ravaging the Amazon rainforest.

Since Brazil is not a G7 member, he told Trump, it was in danger of being "left without a voice," according to a senior Trump administration official familiar with their call.

Mr Trump did not hesitate. "Absolutely, we will be a voice for Brazil," the president responded, said the official, speaking on condition of anonymity to discuss a private conversation.

Within days, Trump delivered as promised. French President Emmanuel Macron announced at the end of last weekend's G7 meetings that member nations had approved a $22 million (£18m) emergency aid package to help combat the fires, but the Trump administration did not support the measure, insisting that any solution should be done in consultation with Brazil, senior White House aides said this week.

Amazon rainforest swept by fires: In pictures Show all 25 1 /25 Amazon rainforest swept by fires: In pictures Amazon rainforest swept by fires: In pictures Fire rages in the Amazon rainforest in the Brazilian state of Rondonina on August 23 Reuters Amazon rainforest swept by fires: In pictures Smoke billlows from burning tracts of the Amazon rainforest in the Brazilian state of Para on August 23 AFP/Getty Amazon rainforest swept by fires: In pictures Fire rages in the Amazon rainforest in the Brazilian state of Rondonina on August 23 EPA Amazon rainforest swept by fires: In pictures Land in the Amazon rainforest left scorched in the fires in the Brazilian state of Rondonina on August 23 AFP/Getty Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Rondonia, Brazil on August 23 AFP Amazon rainforest swept by fires: In pictures Fire tears through a farm in the Brazilian state of Mato Grosso AP Amazon rainforest swept by fires: In pictures An area of the Amazon rainforest left scorched in the fires in the Brazilian state of Amazonas on August 24 AFP/Getty Amazon rainforest swept by fires: In pictures Satellite images show a series of fires in the southwest Brazilian state of Rondonia on August 15 AP Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Rondonia, Brazil Reuters Amazon rainforest swept by fires: In pictures A satellite image released by NASA shows the active fires that have been detected in the Amazon region EPA Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Amazonas, Brazil Reuters Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Rondonia, Brazil Reuters Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Rondonia, Brazil Reuters Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Amazonas, Brazil Reuters Amazon rainforest swept by fires: In pictures Indigenous people from the Mura tribe wallk in a deforested area inside the Amazon rainforest in the Brazilian state of Amazonas on August 20 Reuters Amazon rainforest swept by fires: In pictures Fire tears through a farm in the Brazilian state of Mato Grosso AP Amazon rainforest swept by fires: In pictures Smoke billows from a stretch of fire in the Amazon rainforest in the Brazilian state of Rondonia on 23 August AFP/Getty Amazon rainforest swept by fires: In pictures Smoke billows during a fire in an area of the Amazon rainforest in the state of Amazonas, Brazil Reuters Amazon rainforest swept by fires: In pictures Indigenous people from the Mura tribe wallk in a deforested area inside the Amazon rainforest in the Brazilian state of Amazonas on August 20 Reuters Amazon rainforest swept by fires: In pictures Smoke billows from a stretch of fire in the Amazon rainforest in the Brazilian state of Rondonia on 23 August AFP/Getty Amazon rainforest swept by fires: In pictures A view of logs felled illegally in the Amazon rainforest are seen in sawmills in the Brazilian state of Amazonas on August 22 Reuters Amazon rainforest swept by fires: In pictures A scorched patch of land in the state of Mato Grosso in Brazil on 20 August EPA Amazon rainforest swept by fires: In pictures Several fires are seen burning in the Amazon rainforest in this satellite image taken by NASA on 11 August AFP/Getty Amazon rainforest swept by fires: In pictures Smoke billows from a stretch of fire in the Amazon rainforest in the Brazilian state of Rondonia on 23 August AFP/Getty Amazon rainforest swept by fires: In pictures The sunsets behind clouds and smoke from fires in the Amazon rainforest in the Brazilian state of Rondonia on 18 August EPA

The episode illustrated the success Mr Bolsonaro has had in forging a bond with Mr Trump since sweeping to a surprise election in October behind promises to "make Brazil great again".

A far-right nationalist initially viewed as a long shot, Mr Bolsonaro unabashedly modelled himself after Mr Trump, weaponising social media, bullying rivals and courting the Trump administration by promising strong support for Israel, pressure on socialist regimes in Venezuela and Cuba and newfound potential for bilateral trade.

For that, he earned a special moniker: "Trump of the tropics."

The charm offensive has paid off with a US president eager for acclamation and validation. Mr Trump was the first foreign leader to personally congratulate Mr Bolsonaro after his election, placing a call within an hour of the victory - after national security adviser John Bolton made clear to White House aides that Trump wanted to be the first.

Trump "likes to see himself as the leader of a movement, a global movement, and part of that is to see that the movement is spreading," said Fernando Cutz, who served as director for Western Hemisphere affairs at the National Security Council during Trump's first year and a half in office.

Mr Cutz said Trump grew intrigued by Mr Bolsonaro given the comparisons between the two during Mr Bolsonaro's campaign.

"It helped that Mr Bolsonaro embraced that title and did not run away from it," Mr Cutz said of comparisons. To Trump, "that's a huge plus."

Yet to congressional Democrats, the personal chemistry between the leaders represents another example of the president cosying up to a world leader with anti-democratic, strongman tendencies, sometimes at the expense of US allies.

Aerial footage shows Amazon wildfires burning and devastation left behind

A former national legislator, Mr Bolsonaro earned infamy with a series of bigoted, sexist and homophobic comments, as well as attacks on immigrants. He responded to a female lawmaker who accused him of encouraging rape by saying: "I wouldn't rape you because you don't deserve it."

Mr Bolsonaro, who promised during his campaign to withdraw Brazil from the 2015 Paris climate accord, has drawn international criticism for his stewardship of the Amazon. He has fought back aggressively, denouncing foreign leaders for threatening Brazilian sovereignty and accusing his critics of starting some of the fires to make him look bad.

On Friday, Eduardo Bolsonaro, the president's youngest son, and Brazilian Foreign Minister Ernesto Araújo visited the White House to discuss the situation with national security staff, and they gained a briefing audience with Trump.

Mr Araújo told reporters in the West Wing driveway that Trump reiterated his belief that "it was absurd that some countries think Brazil should not have sovereignty over the Amazon in some way. We're grateful for that stance."

Democrats in Congress have been critical of Trump's embrace of Mr Bolsonaro.

"The one thing that has really drawn our attention is just how far Trump himself has been willing to bend over backward for Bolsonaro," said one Democratic aide on Capitol Hill, who spoke on the condition of anonymity to discuss the matter frankly.

At a bipartisan Senate meeting with Brazilian Vice President Hamilton Mourão in April, according to people who were present, Senator Robert Menendez pressed Mr Mourão on human rights.

Democrats have also raised objections over the fact that Mr Bolsonaro publicly endorsed Trump's re-election during a Rose Garden news conference after their first bilateral meeting at the White House in March.

In addition to Mr Trump, Mr Bolsonaro and his top aides have courted prominent US conservatives, including Stephen Bannon, the former White House adviser who attended a small, private dinner with Mr Bolsonaro in Washington.

Eduardo Bolsonaro, a national legislator in Brazil, also has met with White House adviser Jared Kushner, the president's son-in-law, and with Donald Trump Jr.

One US official said Eduardo Bolsonaro started meeting with administration aides before his father was elected, showing up with carefully crafted talking points, including support for Trump's North Korea policy and echoing Trump by citing the need to overcome a "deep state" bureaucracy in Brazil.

Firefighter combats a fire in the Amazon basin in the municipality Sorriso, Mato Grosso State, Brazil (AFP/Getty) (AFP)

A member of Brazil's National Congress, Eduardo Bolsonaro is in line to be nominated by his father as the next ambassador to Washington, a move Trump has publicly endorsed despite charges of nepotism from some Brazilian politicians.

The Bolsonaros are "completely fascinated with Trump," said Paulo Sotero, a Latin America expert at the Wilson Center who visited Brazil this past week.

The family has indicated that they intend to "satisfy President Trump, which is what President Trump likes to hear," Mr Sotero said, adding that "there will be serious pushback in Brazil."

White House aides expressed satisfaction that the two countries are drawing closer. Since Mr Bolsonaro took office in January, he and Trump have met twice - first at the White House and again in June on the sidelines of the G20 summit in Osaka, Japan.

The Trump administration has rewarded Mr Bolsonaro by publicly supporting Brazil's bid to join the Organisation for Economic Cooperation and Development and elevating Brazil to the status of a major non-NATO ally - over the objections of some Democrats.

During the Rose Garden news conference in March, Trump raised the possibility of installing Brazil as a full-fledged NATO member - even though it is not eligible given that the country is not located in the North Atlantic.

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Aides said Trump first broached the subject during his working lunch with Mr Bolsonaro. Patrick Shanahan, then the acting defence secretary, had just finished briefing on security matters when Trump surprised the room by asking Bolton whether it was possible for Brazil to gain full NATO membership.

"Why not?" Trump demanded, according to multiple people who were present.

"Bolton said something like, 'That would really turn heads,' " said one person who was in the room and spoke on the condition of anonymity to discuss a private conversation.

"I was taken by surprise," said Sergio Amaral, who as Brazil's ambassador to Washington was also in the room. Amaral, who stepped down from his post in May, added in an interview: "After the lunch, there was a follow-up with some important advisers to President Trump. They assessed about how that could work because there are some restrictions."

White House aides confirmed that they have explored the legal possibilities and floated the idea to European allies.

Republicans on Capitol Hill praised the growing partnership. An aide to Senator Marco Rubio, said that "previous administrations were not as aligned with our democratic values as Mr Bolsonaro is. It's a breath of fresh air from our point of view."

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But others have viewed the relationship more sceptically. Analysts said Mr Bolsonaro is trying to hedge against the growing influence of China - Brazil's top trading partner - and they cautioned that achieving a trade deal with Brazil will be challenging given the country's entrenched agricultural lobbies.

Mr Bolsonaro has struggled to follow through on other promises that aimed to please Trump. He has backed off pledges to move Brazil's embassy in Israel from Tel Aviv to Jerusalem and to withdraw from the Paris climate accord.

Even the increased cooperation with the United States on security and defence is a risk, said Guilherme Casarões, an international relations professor at the Getulio Vargas Foundation, a university in Sao Paulo.

"If the United States wants to embark on a military venture in Venezuela or Iran, it is very possible that they will call for Brazilian help," he said. "Brazil's help would not be military or strategy focused; Brazil doesn't have many resources to contribute. But it would legitimize an American military action."

Yet despite the policy obstacles, Mr Bolsonaro views Trump's success in upending the conservative movement in the United States as useful in his political goals, analysts said.

Chris Buskirk, publisher of the journal American Greatness, was among the dozen or so conservatives who, along with Mr Bannon and Mr Amaral, dined with Mr Bolsonaro at the Brazilian ambassador's residence in March. Mr Buskirk said he marvelled at the Bolsonaro team's intimate familiarity with the debate over conservatism in the United States.

"They were looking to American conservative intellectual history as a way to figure out their next best steps," he said.

Mr Bannon was so impressed that he named Eduardo Bolsonaro as the chief representative in South America for his global populist organisation, known as the Movement.

Matt Schlapp, chairman of the American Conservative Union, who also was present at the dinner, said he and Eduardo Bolsonaro have arranged to hold a National Conservative Political Action Committee event in Brazil in October.

"I consider him a friend," Mr Schlapp said. "We've shared ideas on the ways that the movement in each country can collaborate." Last week, Mr Schlapp, whose wife, Mercedes, served as the strategic communications director at the White House until departing in July, used a tweet to take Brazil's side in the dispute with Macron over the management of the Amazon.

Some in Brazil have raised concerns that Mr Bolsonaro is establishing a back-channel to bypass formal diplomatic avenues to influence Trump.

But a senior Trump administration official insisted that the White House has not been lobbied by conservative outsiders and pointed out that Mr Bolsonaro has an open line to the president.

"If they want to talk to the White House, they can do what Mr Bolsonaro did last week - pick up the phone and call," the official said. "We're only a phone call away."