General Motors Co. is reviewing a counterproposal this morning that the United Auto Workers submitted to the Detroit automaker on Friday night.

The union’s proposal is a counter to the offer GM made on Monday.

The offer included “all of your outstanding proposals that are at the main table and unsettled,” UAW Vice President Terry Dittes wrote in a letter to local union leaders Friday. If GM accepts, “we will have a Tentative Agreement,” he wrote.

Dittes said union representatives would work through the weekend in hopes of reaching a settlement to end a nationwide strike by 46,000 workers that is nearing the one month mark. His letter did not disclose any of the proposal’s terms.

GM’s latest offer to the UAW included $2 billion more in investment by the company than an offer it made four weeks ago.

In total, GM would commit to $9 billion worth of direct and indirect investments. Of that, $7.7 billion would be direct investments, including building an electric truck at the Detroit-Hamtramck Assembly plant. That factory is among four GM facilities in the U.S. that were to be idled. In the 2015 contract, GM had pledged $8.3 billion in investments.

The offer also includes increases in employee compensation, as well as retaining health care coverage and creating a pathway for temporary employees to become permanent, according to a letter GM sent Friday to hourly and salaried employees. No specifics were given.

In an escalating war of words between the two sides on Friday, the union responded with a strong statement saying at every step in negotiations GM “has attempted to undermine the ongoing, good-faith efforts the UAW has made to end this strike.”

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