Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE on Thursday criticized online retail giant Amazon for paying nothing in corporate taxes last year, making him the latest presidential candidate to slam one of the most profitable companies over its effective tax rate of below zero.

"I have nothing against Amazon, but no company pulling in billions of dollars of profits should pay a lower tax rate than firefighters and teachers," Biden tweeted. "We need to reward work, not just wealth."

I have nothing against Amazon, but no company pulling in billions of dollars of profits should pay a lower tax rate than firefighters and teachers. We need to reward work, not just wealth. https://t.co/R6xaN3vXGT — Joe Biden (@JoeBiden) June 13, 2019

report from the Institute on Taxation and Economic Policy earlier this year found that 60 Fortune 500 companies, including Amazon, avoided paying any federal income taxes in 2018.

Amazon, which had $11.2 billion in profits last year, has become a prime target for Democrats seeking to criticize corporate power, potentially anticompetitive practices and dangerous working conditions.

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The company has been accused of mistreating warehouse workers, and it's facing multiple lawsuits from former employees who said they were treated inhumanely at the facilities. Amazon has said it treats its workers fairly.