Donald J. Trump is demonstrating what many of us have believed all along about the president of the United States.

He lacks compassion or any semblance of understanding of other people’s suffering.

The crisis along the southern border involving the detention of those migrant children offers a vivid example of that absence of compassion.

When asked about the matter, the president is incapable of expressing any form of sincere pain or anguish over what is transpiring. Instead, he diverts blame, contending — with more lies — that President Barack Obama established the policy of separating children from their parents and detaining them in squalid facilities along our border.

He issues a warning about mass deportation, then pulls back on the threat and gives Congress two weeks to work out a political solution. Is he offering any recommendation? Is the president’s homeland security or national security team providing any guidance? Have they laid out a template for a solution?

No! He is posturing, tweeting and bellowing about how the nation’s economic health is luring migrants across our borders “illegally.”

I want the president to deliver some indication that actually cares about those children. I want him to speak to their suffering. I want him to declare his anger over statements that those children are being denied personal hygiene items and that they are living in unsafe and unsanitary conditions.

Except that he doesn’t care!