President Donald Trump warned this week at the country's largest retailer on Saturday that prices had to be raised due to tariffs.

"Walmart should stop trying to blame tariffs on the reasons for raising prices," Trump wrote in Society of Truth. "Between Walmart and China, they should be like "eat tariffs" without charging any fees to valuable customers.

"We have lowered the price increase before, so it's a challenging environment," Walmart Chief Financial Officer John David Rainey said in an interview with CNBC on Thursday.

As the country’s retail giant and largest grocer, Walmart is often seen as a leader in the health of retailers and U.S. consumers.

Renney said he was "happy with the progress made by the (Trump) administration with levels of tariffs announced in early April, but they are still too high." Despite a 90-day probation, he lowered tariffs on Chinese imports to 30%. Commodities from dozens of other countries face 10% of their responsibilities. Walmart imports electronics and toys from China and produces avocados and bananas from Central and South America.

Retailers want to keep their prices below competitors, he said, especially as shoppers seek discounts. To this end, he said Walmart will absorb some higher costs related to tariffs, and he hopes suppliers will absorb some higher costs as well.

Renney said the company will "try to work with suppliers to keep prices low."

Walmart responded to that view on Saturday when asked to comment on Trump's position.

"We have been working to keep prices as low as possible and we won't stop," Walmart said in a statement. "We will keep prices low as long as we can bring in the reality of smaller retail margins."

Walmart joins a growing number of companies that have seen prices rise or warn that prices are being launched due to tariffs. Microsoft said earlier this month it raised the recommended retail price for Xbox video game consoles and some controllers.

Barbie doll maker Mattel announced earlier this month that it will move production out of China, but prices are still expected to rise. Ford warned last week that prices of certain cars must be raised.

Wal-Mart maintained its sales forecast for one year on Thursday but refused to provide earnings or operating revenue forecasts for the second fiscal quarter, citing frequent changes in the Trump administration’s tariff policies.

Major U.S. retailers, including Target, Home Depot and Lowe's, are expected to share the impact of tariffs when reporting results next week.

Walmart's shares ended 2% on Friday at $98.24.