Dan Janison Melville. N.Y. Tuesday January 26, 2010. Daniel Janison,

Dan Janison has been a columnist at Newsday since 2007.

President Donald Trump last week commenced a marketing tour of sorts to sell a new product — an overhaul of the American tax system.

The product remains in development.

By all accounts, the White House has outsourced the crafting of crucial details to the Republican Senate and House majorities.

Before the businessman-president can put his brand name on any tax law, Congress must build it out, create cost estimates and line up the needed support within the GOP.

Trump traveled to Missouri last week to tout ideas that were broadly outlined before and after his election.

Relying on a “contractor” such as Congress to build the product might sound like an iffy idea. But the legislative branch does the legislating, and therefore calls the shots anyway.

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Trump uses populist talking points to drive interest and demand. His overall message is that sweeping changes in the corporate tax code will boost U.S. manufacturing by giving our businesses reason to invest in plants and jobs here.

Critics argue that it is labor costs, not taxes, that sent jobs overseas. Democrats, now out of power, will keep shouting that his plan favors the rich and represents just more “trickle-down” ideology.

So Trump made the first in a planned series of speeches to dispute those critics by renewing his promise of a boost for the middle class and small business.

“This is where Main Street will begin its big, beautiful comeback,” the president told an audience at the Loren Cook company in Springfield, which makes fans, blowers, gravity vents and laboratory exhaust systems. “You’re seeing it right now.”

The upcoming congressional calendar includes efforts to avoid a government shutdown, raise the debt ceiling, and meet new funding challenges in the wake of Harvey.

Attempts at repealing Obamacare also will rekindle, at some point.

Meanwhile Trump has criticized the way Senate Majority Leader Mitch McConnell runs his house. House Speaker Paul Ryan also is drawing heat from what some have started to call the Trump “wing” of the GOP.

“I don’t want to be disappointed by Congress — do you understand me?” he said. “I think Congress is going to make a comeback. I hope so.”

Trump and Congress are partners in many joint ventures still to take shape. He said his tax changes will be “pro-growth, pro-job, pro-worker and pro-America.” The political investment is big in this product-still-to-be.