Brazil's President Jair Bolsonaro is willing to accept foreign aid for fighting fires devastating the Amazon rainforest, but only if the country controls the funds, his spokesman said Tuesday.

Bolsonaro has been involved in an escalating war of words with Macron over the worst fires to hit the Amazon in years – blazes that have sparked a global outcry and threatened to torpedo a huge trade deal between the European Union and South American countries.

A top Brazilian official on Monday rejected the G7 countries' offer of $20 million to combat the fires devastating the forest in Brazil and Bolivia, saying Macron should take care of "his home and his colonies."

Macron and Bolsonaro have repeatedly locked horns in the past week, with the French leader accusing Bolsonaro of lying to him about his commitments on climate change and vowing to block the EU-Mercosur trade deal involving Brazil that took decades to negotiate.

On Monday, Macron rebuked the "extraordinarily rude" Bolsonaro after the Brazilian leader personally expressed approval for a Facebook post implying that Brigitte Macron was not as attractive as his own first lady, Michelle Bolsonaro.

Read more: Amazon wildfires spark global concern over climate change, biodiversity

Read more: Wildfires continue to engulf the Amazon rainforest

Bolsonaro, a climate-change skeptic, is finding himself increasingly isolated on the global stage over his response to the blazes, which has triggered worldwide protests. 

The fires are not limited to Brazil, with at least 10,000 square kilometers burning in Bolivia, near its border with Paraguay and Brazil.

Bolivia's President Evo Morales on Tuesday gave a half-hearted welcome to the G7 aid pledge, which he described as "tiny."

Morales and his rival for the Bolivian presidency have suspended campaigning to deal with the voracious fires that the president said had destroyed 1.2 million hectares of forest and grassland since May.

Neighbors Peru and Colombia on Tuesday asked Bolsonaro to attend a meeting on September 6 to discuss the disaster and come up with a long-term coordinated plan to stop deforestation.

(With input from agencies)